Abstract: An optical-pick up preventing the deterioration of the optical property by mounting the entire optical system on the movable portion and aligning the optical axis of the semiconductor laser element having the shortest wavelength with the center of the optical axis of the objective lens and an information recording and reproducing apparatus on which the optical pick-up is mounted.

Abstract: The optical pickup apparatus 100 uses a semiconductor laser element 50 integrated a first light emission source 36 for emitting a first laser beam with a second light emission source 40 for emitting a second laser beam, of which wavelength is different from that of the first laser beam. The optical pickup apparatus 100 is constructed so that a first half mirror functional surface 52b and a second half mirror functional surface 52c are provided in a beam splitter 52 to match an optical path in which the first laser beam passes through the first half mirror functional surface 52b of the beam splitter 52 and then is reflected at the second half mirror functional surface 52c and again is emitted from the first half mirror functional surface 52b to be directed toward a bifocal lens 54 with an optical path in which the second laser beam is reflected at the first half mirror functional surface 52b to be directed toward the bifocal lens 54.

Abstract: A point where a first diffraction grating and an incident optical axis intersect is named as first intersection point, lengths from the first intersection point to points where ±primary-order diffracted lights by the first diffraction grating intersect a light receiving plane are named as first-a(1a) optical path length, first-b(1b) optical path length, and an average thereof is named as first average optical path length.

Abstract: This invention relates to a multi-wavelength optical disc and an apparatus and method to read or write signal therefor. The multi-wavelength optical disc comprises a substrate and a recording layer comprising various photochromic materials to store more data, and a reflective layer on the recording layer. The apparatus comprises at least one monochromic sources to generate a monochromic light beam, each with different wavelengths, a beam combiner to combine the light beams to a coaxial parallel light beam containing various light signals with different wavelengths, and a beam focalizer to focus the light beam on the optical disc. The apparatus also comprises a beam splitter and light detector to read the data recorded on the disc.

Abstract: Optical detection apparatus comprises a solid state laser having an intracavity optical waveguide that supports a lasing filament and operates in one of two states: (1) in a first state, the filament is fixed in one of two orientations, and (2) in a second state, the filament may be induced to switch or oscillate between the two orientations, or it may be suppressed altogether. At least one feature is located on the output facet off-center with respect to the waveguide cross-section in order to provide a preferred orientation for the filament. In one embodiment, a single feature is located off-center and optical radiation of one intensity is injected through the facet feature, thereby causing the laser to operate in one of its states, whereas injected radiation of another intensity causes the laser to operate in the other of its states. The injected radiation may be radiation emitted by the laser that is reflected by an object (e.g.

Abstract: An optical head for near-field recording and reproduction, and a method of manufacturing the optical head. A vertical cavity surface emitting laser (VCSEL) and a photodetector are formed on a slider, and a lens layer, an optical path control layer and/or a coil member are directly formed over the VCSEL and the photodetector by thin film deposition. Combining the optical system for information recording and reproduction with the slider reduces the size of the optical head compared with an optical head adopting a slider and a large optical system which are separated from each other. As a result, dynamic characteristics of the optical head improve, thereby reducing the time required for searching for a target track. Thus, the optical head is suitable for a micro information recording and reproducing system.

Abstract: An objective lens converges a shorter wavelength laser beam on a DVD having a protective layer, which is 0.6 mm thick, and a longer wavelength laser beam on a CD having a protective layer, which is 1.2 mm thick. A common region is defined on the objective lens. The common region provides a numerical aperture appropriate for converging the longer wavelength laser beam on the CD. Coma of the objective lens in the first region is compensated better in a case where the longer wavelength laser beam is converged on the CD than a case where the shorter wavelength laser beam is converged on the DVD.

Abstract: An optical pickup apparatus includes a light source having a plurality of integrated light emitting portions for emitting laser beams of different wavelengths, the light source being adapted to selectively emit one of the laser beams of different wavelengths; a photodetector for detecting the laser beam; and an optical system for directing the laser beam emitted from the light source to the disc, and for directing the laser beam reflected by the disc to the photodetector. The light source is positioned such that a straight line connecting respective light emitting points of the plurality of light emitting portions is coincident with a tangential line of a track on a disc to be reproduced.

Abstract: In optical heads with multiple semiconductor laser chips with different wavelengths, coma aberrations generated by laser beams projected at an angle relative to the entry axis of a focus lens is reduced.

Abstract: A laser diode chip for an optical pickup apparatus, in which a plurality of laminated light emitting portions which emit laser beams having different wavelengths are formed on a substrate, and light emitting points of the plurality of light emitting portions are placed at positions separated by different lengths from each other in the laminate direction from the same plane of the substrate.

Abstract: An integrated type optical pickup module apparently approximates a plurality of light-emitting points of semiconductor lasers. An optical element is interposed between first and second semiconductor lasers. The optical element has first and second reflecting surfaces perpendicular to each other. The first and second reflecting surfaces reflect laser beams projected from the first and second semiconductor lasers, respectively. The optical element further has a mounting surface perpendicular to both the first and second reflecting surfaces. The optical element is mounted, via the mounting surface of the optical element, to a submount having a top surface on which the first and second semiconductor lasers are mounted. Heterojunction surfaces of the first and second semiconductor lasers may be substantially perpendicular to the first and second reflecting surfaces, respectively.

Abstract: A semiconductor laser device is provided which can carry out recording and reproduction with respect to optical disks with different formats. In this semiconductor laser device, a receiving/emitting optics integrated substrate, in which two semiconductor laser elements with different emission wavelengths and a plurality of receiving optics are integrated, is disposed in a case and is sealed with a hologram element. A composite prism is placed on the hologram element. The distances, when measured in air, from the two semiconductor laser elements to a focusing means, for example, a collimator lens are set to be substantially equal. Thus, a small and inexpensive semiconductor laser device can be obtained. In addition, a single collimator lens can be employed, and thus the optical configuration is facilitated.

Abstract: In a photodetector, the minimum size of the photodetection area for detecting a focus error signal from a light beam on the inner radius side of a hologram is made smaller than the minimum diameter of diffracted light beam spots (30, 31) for recording and reproduction, and when a CD is reproduced, a light beam close to the optical axis is made to significantly contribute to the focus error signal and the minimum size of the photodetection area for detecting the focus error signal from a light beam from the peripheral side of the hologram is made larger than the minimum diameter of diffracted light beam spots (130, 131) for recording and reproduction, whereby the focus error signal is made equal to the normal focus error signal when a DVD is reproduced, so that the focus offset variation caused when the base material thickness varies can be reduced.

Abstract: The thickness of the transparent substrate of an optical disk has been selected from the range from 0.2 mm to 0.4 mm. The wavelength of a light beam passing through the transparent substrate has been selected from the range from 400 to 420 nm. The numerical aperture of an objective for converging the light beam has been selected from the range from 0.60 to 0.75.

Abstract: An apparatus and method for mass producing optically readable discs includes providing an array of light emitting devices which are arranged in a spiral pattern corresponding to the spiral track along which data is recorded on optically readable discs. The light emitting devices of the array are driven selectively to expose a layer of photoresist on a substrate. The light is focused on the substrate by an array of micro-lenses corresponding to the array of light emitting devices. When the photoresist on the substrate is developed, it can either by cured for use as a stamper or metallized for use in forming, in succession, a father, a mother and a stamper.

Abstract: An optical recording head which decomposes light emitted from a light source into three primary colors with rotation of a color wheel, emits the light linearly through an optical fiber array, illuminates an optical valve array through an integrator and an illuminating optical element array and exposes a photographic paper to light modulated by the optical valve array through an imaging optical element array. The integrator is formed by arranging two mirrors in parallel to each other, and a rod lens is provided between the mirrors. The rod lens has a refracting power to decrease the divergent angle of the light emergent from the optical fiber array.

Abstract: An optical scanner employs a read/write head formed on an optoelectronic chip. The chip has a laser source and a diverging series of light guides interconnected with switches under control of a controller. The light from the light source is transmitted to multiple output apertures during reading operations, since, usually, less intensity is required to read data that to write it. This allows multiple channels to be read in at the same time. The light is directed to a selected output aperture during writing operations so that all of the light from the laser source is used for writing. In another embodiment, light from a small number of lasers is directed to a diverging series of light guides leading to multiple apertures, but the light fed into the input light guides comes from a small number of lasers, which could be one laser, or from a larger number of lasers, which could be two lasers.

Abstract: An optical pickup for recording/reproduction. The optical pickup includes a light source unit including a light emitting diode (LED) to emit light and a waveguide to condense the light emitted from the LED; a collimating lens to collimate the light emitted from the waveguide; an objective lens to condense the light passed through the collimating lens to form a light spot on the recording surface of a recording medium; a light path changing unit arranged on an optical path between the collimating lens and the objective lens, to change a traveling path of the incident light; and a photodetector to receive the light incident via the objective lens and the light path changing unit after being reflected from the recording medium.

Abstract: A first laser beam and a second laser beam are selectively generated. The first or the second laser beam is irradiated on an optical storage medium having a recording layer on which main data has been recorded. The main data includes data to be reproduced and reproduction management data. The laser beam selection is made according to the reproduction management data. The first laser beam has a first laser power capable of carrying the main data without erasing when reflected from the optical storage medium. On the other hand, the second laser beam has a second laser power capable of erasing the main data from the optical storage medium while carrying the main data when reflected from the optical storage medium. The data to be reproduced and carried by the first or the second laser beam is then reproduced.

Abstract: Optical reading device (1) for reading digital data from a reflecting medium (4), comprising a lighting source (8), means (10) for focusing the beam emitted by the source onto an area (S) of the medium, means (R) for receiving the light energy reflected and means (12) for processing the signals delivered by the receiving means. The device (1) comprises at least one second unfocused lighting means (E) installed on or near the reading device (1) so as to use its beam (F) to illuminate the focusing area (S) of the source (8) on the medium (4), the wavelength and the luminous power of this second lighting means (E) being chosen in such a way that the reproduction of the data is improved.

Abstract: A scanning device is designed for optically scanning a first record carrier (1) having a first information plane (3) and a first transparent layer (2) of a first thickness and for scanning a second record carrier (18) having a second information plane (20) and a second transparent layer (19) of a second thickness different from the first thickness. The device comprises a radiation source (5, 22) for generating a radiation beam (6, 23) and an objective lens (9) for focusing the radiation beam through one of the transparent layers on one of the information layers. The radiation source comprising means for adapting the vergency of the radiation beam to a first value for scanning the first record carrier and to a second value for scanning the second record carrier. The objective lens has a convex surface (28) and a concave surface (29), the convex surface facing towards the radiation source.

Abstract: Methods and apparatus are provided for retrieving encoded information from data tracks on an optical disk using an array of microlasers as the illumination sources, an array of micro-scale photo detectors as the detection elements, and a bilens (BL) or a holographic optical element (HOE) as the main optical component. Multiple configurations are provided to position microlasers and photo detectors together on a mobile laser/detector block (LDB). The microlasers and detectors may be arranged in a hexagonal lattice relationship for an optimally compact arrangement. Laser beams generated by the surface-emitting microlasers are guided by the BL onto the optical disk (OD) surface. The reflected light is collected by the same BL or HOE, shifted, and then directed back onto the respective photo detectors on the LDB. Illumination, detection and alignment methods and apparatus for tracking, focusing, and magnification servo controls are also incorporated on the LDB.

Abstract: An optical pickup capable of recording or reproducing information from optical disks having different recording densities includes a first optical unit having a light source which emits rays having a first wavelength for DVDs and a first light sensor which detects reflected rays, a second optical unit having a light source which emits rays having a second wavelength for CDs and a second light sensor which detects reflected rays, a beam splitter which directs the rays having the first wavelength and the rays having the second wavelength along substantially the same optical axis, and directs reflected rays from an optical disk to the first light sensor and the second light sensor, and an objective lens which has a numerical aperture (NA) of 0.6 or more, a focal length of 2.5 mm or less, an effective diameter of incidence of 3.0 mm or less and a working distance of 1.2 mm or less. The light pickup as a whole has a thickness of 7.5 mm or less as measured from a bottom surface of the optical disk.

Abstract: Disclosed is an optical memory head in which a vertical cavity surface emitting laser array constituted by laying out, in a matrix form, a large number of vertical cavity surface emitting laser elements each having a laser output part with an ultra fine hole as an output window for emitting evanescent light is arranged such that the layout direction of the laser element is inclined with respect to the tangential direction to rotation of an optical recording medium at a fine angle.

Abstract: An optical pickup is provided with a main beam for performing recording or playback on a disc and an advance beam in a position ahead of this main beam to detect the surface state of the disc; the surface state of the disc is detected on the basis of the light reception information (an MO signal or an RF signal) of this advance beam; and control is so effected that, at the timing of the main beam passing the position where adhesion of dust or the like to the disc is detected, the laser output power of the main beam reach a level at which satisfactory operation can be executed even if there is dust adhesion or the like so as to make possible execution of accurate recording and playback operations, even if the thickness of a disc-shaped recording medium is thinned, without being affected by dust or the like stuck to the surface of the disc-shaped recording medium.

Abstract: There is provided a three-dimensional imaging system (2), including a first camera (6) and a second camera (8), both facing a field of view of two-dimensional images and a normally open, fast gating device (12) interposed between the second camera (8) and the field of view (14 and 26). The system further includes a frame grabber (10) connected to the first and the second camera, and a computer (14) for receiving signals representing, pixel by pixel, light intensities of an image during a predetermined period of time and signals representing same pixel by pixel of light intensities arriving at the second camera until the fast gating device (12) is closed, and for determining three-dimensional imaging signals therefrom to eventually be displayed. A method for producing three-dimensional imaging is also provided.

Abstract: In a method and an apparatus initializing an optical recording medium by irradiating a flash light. Walls are formed on a holder for holding the optical recording medium so as to adjoin an inner edge and an outer edge of the optical recording medium. When a flash light irradiates, a part of incident light which obliquely enters into an inner and an outer periphery regions of the optical recording medium is shaded by the walls. A quantity of the incident light incident on a unit area in each of the inner and outer periphery regions is less than that in a recording region between the inner and outer periphery regions. When temperature in the recording region reaches to an initializing temperature, the temperature in each of the inner and outer periphery regions is lower than the initializing temperature. So that neither cracks nor corrugations occur in a recording layer in the inner and outer regions.

Abstract: A different wavelength type of optical source module which generates light beams different in wavelength. In the optical source module, laser diodes are provided to be opposed to each of reflective films which is arranged to make a shape of a mountain. These respective laser diodes generates laser light beams different in wavelength. The light beams generated at the laser diodes are reflected by the reflective films at a right angle to progress along the same path.

Abstract: An optical information recording/reproducing apparatus records information on an optical information recording medium and/or reproduces the recorded information by irradiating a plurality of light spots on the recording medium. The apparatus includes a first light source for emitting a light beam with a wavelength .lambda..sub.1, and a second light source for emitting a light beam with a wavelength .lambda..sub.2. A light spot forming unit focuses the light beam with the wavelength .lambda..sub.1 and the light beam with the wavelength .lambda..sub.2 through an objective lens, and forms first and second light spots on the information recording medium. The following relations are substantially established: 1.gtoreq.D.sub.1 /W.sub.1.perp. .gtoreq.0.6; 3.2-2.6.times.1n.alpha..gtoreq.D.sub.2 /W.sub.2 .perp..gtoreq.1.0-1.2.times.1n.alpha.; and .alpha.=(.lambda..sub.2 /.lambda..sub.1).times.(D.sub.1 /D.sub.2). D.sub.1 is the diameter of the light beam with the wavelength .lambda..sub.

Abstract: An integrated read/write head structure saves and retrieves saved data stored in storage locations on a ferroelectric optical storage medium. A first ultra-violet light emitting diode generates a single beam for exciting the electrons of a ferroelectric molecule of the optical storage medium. An induced electric field transducer orients the ferroelectric molecules potential difference during saving data. A second ultra-violet light emitting diode generates a single beam and a silicon photo diode detects the reflected ultra-violet light from a ferroelectric molecule.

Abstract: An optical pickup capable of multiple track scanning, including a light source having at least two vertical cavity surface emitting lasers (VCSELs) to emit at least two or more light beams and a light controlling device for controlling the focal position of a light formed on one type of recording medium of two formats of different thicknesses, is provided. The light emitted from each VCSEL is focused on adjacent tracks of the recording medium via a polarization beam splitter, the light controlling device and an objective lens in sequence, and the light reflected from the recording medium is received by a photodetector via the objective lens, the light controlling device and the polarization beam splitter. The number of photodetectors correspond to the number of VCSELs to receive lights corresponding to each track.

Abstract: An optical information recording/reproducing apparatus having a laser light source driven through a high frequency imposing circuit comprises a high frequency imposing circuit, electrical terminals of said laser light source being enclosed by a conductive shield case, which is composed of a pair of half cases, each of half cases contacting with the other half case and having a wall which overlaps with a wall of the other half case, a capacitor being coupled between at least of of lead lines for external connection of said high frequency imposing circuit and said laser light source, and ground, a junction of said capacitor and said lead line locating close to a wall of said shield case, and said lead line for external connection being taken out of the shield case through a gap between overlapping walls of said two half cases.

Abstract: A two dimensional laser diode array consists of rows and columns of individual multimode laser diodes, each diode having a separate collection lens. The array is imaged at a large reduction ratio to achieve high resolution recording. In order to decrease the apparent spacing of the diodes in the scanning direction, the rows are staggered relative to the scan direction. In order to avoid variations caused by the near-field non-uniformity of multimode diodes the final spot generated on the media is an image of the aperture of the collecting lens and not of the diode facet. The larger dimension of this aperture, formed by the diffraction limited direction of the laser diode, is reduced by using anamorphic optics.

Abstract: An optical pickup is disclosed which is capable of recording or reproducing information from optical disks having different recording densities and includes a first optical unit having a light source which emits rays having a first wavelength for DVDs and a first light sensor which detects reflected rays, a second optical unit having a light source which emits rays having a second wavelength for CDs and a second light sensor which detects reflected rays, a beam splitter which directs the rays having the first wavelength and the rays having the second wavelength along substantially the same optical axis, and directs reflected rays from an optical disk to the first light sensor and the second light sensor, and an objective lens which has a numerical aperture (NA) of 0.6 or more, a focal length of 2.5 mm or less, an effective diameter of incidence of 3.0 mm or less and a working distance of 1.2 mm or less. The light pickup as a whole has a thickness of 7.

Abstract: An updatable optical data storage disc for use with a laser includes a substrate and a recording layer. The substrate contains pre-recorded information in the form of concentric or spiral tracks of pits. Recordable tracks are positioned between adjacent pre-recorded tracks, whereby the tracks on the disc alternate in the radial direction. Laser light reflected from the recorded portions of the recording layer has a different phase than does light reflected from the unrecorded portions. This phase difference must be significant enough to be sensed by the detector. The difference in the reflectivity of the unrecorded and recorded portions of the recording layer should be minimized. The invention also includes a method and drive compatible with the disc.

Abstract: An optical pickup which can be employed for different formats of a disk recording medium is disclosed. The optical pickup device includes a light source including first and second vertical cavity surface emitting lasers closely disposed to each other for emitting light having different wavelengths and different radiation angles, an objective lens for focusing the light emitted from the light source on a recording surface of a recording medium, a photodetector for detecting information signals and error signals by receiving the light reflected from the recording medium, a polarized beam splitter disposed on an optical path between the light source and the objective lens to redirect a proceeding path of incident light, and a wavelength plate disposed on the optical path between the objective lens and the polarized beam splitter to convert a polarization component of incident light.

Abstract: An optical pick-up according to the present invention is designed such that laser beams having different polarization directions or different radiation angles are irradiated from laser beam sources formed in a surface emitting laser array to change the effective numerical aperture of an optical element having an objective lens, or the like. An optical pick-up having high capability with an optical disk having a low recording density and a thick substrate according to the CD standard, and an optical disk having a high recording density and a thin substrate according to the DVD standard, can be realized. A plurality of laser beam sources can be formed in a small space by employing a surface emitting laser array, and the numerical aperture of the optical system can be controlled by selecting a laser beam. For this reason, an optical pick-up having compatibility can be realized with an extremely simple arrangement, and a compact and high-performance optical pick-up can be provided at low cost.

Abstract: A method of coating an optical recording layer on a transparent grooved substrate is disclosed. The recording layer is coated from a mixture of a primary and a secondary solvent. The solvent mixture provides a wide range of conformalities for optical recording layers.

Abstract: There is provided an optical pick-up apparatus including (a) a plurality of light emitting devices emitting laser beams having different wavelengths, (b) inclined reflective surfaces by the same number as that of the light emitting devices for reflecting the laser beams, (c) the same number of optical systems for image-formation as that of the light emitting devices, each of the optical systems being disposed just above each of the inclined reflective surfaces, each of the optical systems focusing the laser beams reflected at the inclined reflective surfaces on an optical disk medium and transmitting therethrough the laser beams reflected from the optical disk medium, and (d) a light receiving device receivable all of the reflected laser beams. In accordance with the above mentioned optical pick-up apparatus, all laser beams emitted from the light emitting devices and reflected from the optical disc medium are received in the common light receiving device.

Abstract: An optical pickup includes at least two vertical cavity surface emitting lasers (VCSEL) disposed adjacent to each other on the same substrate for emitting light having different emission angles, a light path converter for converting the travel path of incident light, an objective lens for focusing incident light to form an optical spot on an optical recording medium, and an optical detector for receiving light which is reflected by the optical recording medium and passed through the objective lens and the light path converter. The optical pickup selectively drives one of the VCSELs so that disks of different thicknesses can be compatibly adopted, and high efficiency of light can be secured.

Abstract: An optical information reproduction apparatus includes a semiconductor laser device as a light source which provides oscillation as periodic pulse waves upon application of a DC current. The semiconductor laser device is disposed so that an optical distance L from a light-emitting point of the semiconductor laser device to a recording surface of an optical recording medium satisfies the following relationship: TP<(4L/C) and T>TP+(2L/C), where T is a period of pulse waves which are output from the semiconductor laser device in absence of a returning light from the optical recording medium; TP is a pulse width of the respective pulse waves which is defined as a width of a portion of the respective pulse waves, the portion having intensities which correspond to 10% or more of the peak intensity of the respective pulse waves; and C is a speed of light through air.

Abstract: An optical disc apparatus is provided by putting together two substrates with a combined thickness "h", as a recording medium. The two substrates each have a signal mark or a reflective layer which is capable of being the signal mark at least on the backside of the substrates. A laser beam is radiated onto the optical disc through an objective lens, and a reflected light from the reflective layer is detected by means of an optical detection device. One output of the optical detection device is supplied to a signal reader; the other of output thereof is supplied to a focusing apparatus for detecting a focus error of the objective lens and for controlling the positions of the objective lens with respect to the optical disc. Further, in the optical disc apparatus, if a principal wavelength of laser beam source is set as .lambda..sub.0 ; a half-width of laser beam source is set as .DELTA..lambda.; a numerical aperture of the objective lens is set as NA; and a refractive index of substrate material is set as n.

Abstract: For the sake of reducing the number of parts and simplifying adjustment for the optical positions of the parts in an optical device wherein information signals from the light scattered or diffracted which is derived from an optical recording medium are detected, there is provided the optical device of the invention comprising a semiconductor substrate provided with a plane light emitting laser element and a photodiode; and an optical system; a layout position of the photodiode being selected in a region which extends out of the confocal region of the optical system, and from which the light scattered or diffracted from a section irradiated with laser light irradiation derived from the plane light emitting laser element with respect to the section to be irradiated.

Abstract: A semiconductor light emitting device comprises: a compound semiconductor substrate; an n-type cladding layer on the compound semiconductor substrate; an active layer on the n-type cladding layer; a p-type cladding layer on the active layer: and a p-type contact layer on the p-type cladding layer, the n-type cladding layer, the active layer, the p-type cladding layer and the p-type contact layer being made of II-VI compound semiconductors containing at least one of group II elements selected from the group consisting of Zn, Cd, Mg, Hg and Be and at least one of group VI elements selected from the group consisting of S, Se, Te and O, characterized in that at least the active layer has undulations and at least the p-type layer is flat.

Abstract: A read/write head assembly for use in optical disk drives and the like. The head assembly includes multiple vertical surface emitting lasers (VSELs) for reading and writing the optical disk. The reading and writing functions are provided by different VSELs. The VSELs are constructed on a common substrate together with one or more photodetectors for detecting light reflected from the disk. Multiple reading assemblies, each comprising a photodetector and VSEL, may be implemented on the same substrate thereby increasing the rate at which data may be read from the disk. In addition, multiple VSELs for writing the disk may be implemented on the common substrate thereby increasing the rate at which data is written to the disk.

Abstract: A photon mode reaction is caused in an optical recording medium by irradiating the optical recording medium susceptible to the photon mode reaction with light emitted from a light emitting device when driven by a pulsed current.

Abstract: An apparatus for correcting positional deviation of the light source emitting light beams in an image recording apparatus is disclosed which corrects change of the image size (dimensions of the image) on the photosensitive member due to positional deviations of beam spots on the photosensitive member on account of physical distortions caused by external vibration, temperature change, and the like. Changes in the diameter of detective light beams are measured by photodetecting portions 5.sub.R and 5.sub.L and piezoelectric devices 6a and 6b are driven based on the results of the detection, whereby the semiconductor laser array 1 is moved so that the multiplication b/a for the image size may be kept constant.

Abstract: An optical pickup is provided which detects information contained in an optical disk. The optical disk includes a light source, a hologram device, an objective lens, a photodetector, and a single chip. The light source is formed of a first vertical cavity surface-emitting laser (VCSEL) diode and emits a light beam. The hologram device converts the light beam emitted from said light source into a polarized parallel light beam and diffracts a reflected parallel light beam reflected from said optical disk to produce a diffracted beam. The objective lens focuses the polarized parallel light beam on said optical disk and converts a corresponding reflected beam into the parallel reflected beam. The photodetector is formed of a second VCSEL diode and detects various characteristics of the diffracted beam. Finally, the light source and the photodetector are integrated on the chip.

Abstract: The disclosure relates to a laser (L) and to at least one detector integrated side by side on one and the same substrate so that the laser emits, through the edge of the device, a light beam along a direction and so that the detector can detect, through the same edge of the device, a beam substantially parallel to this direction of emission. In a system for the optical reading of a recording medium, the light emitted is reflected by the medium to be read to the detector or detectors. A diffraction grating (RZ) that diffracts only diffraction waves with the same sign (positive for example) deflects at least a part of the light to the detector or detectors. Application to the reading of optical disks.

Abstract: A laser light detect/emit package 3 and a biaxial drive portion 5 for driving the objective lens 4 are supported on a wiring board 1 having wiring patterns 2a and 2b to electrically connect them to the wiring patterns 2a and 2b. Packaged in the laser light detect/emit package 3 are a laser coupler 11 having an optical prism 15 and a laser chip 16 formed on a photo diode IC 14 including photo diodes 12 and 13 for detecting optical signals. In lieu of the laser light detect/emit package 3, an auxiliary wiring board supporting the laser coupler 11 may be inserted and held in a recess formed in the wiring board 1.