Abstract: A method and computer program product for running state machines by the steps of running at least a first and a second state machine in parallel, observing at least the first state machine for at least one first synchronization rule, and changing the state of the second state machine when the first synchronization rule applies.

Abstract: Correction for eliminating deformations of an image to be output from an image apparatus is executed while suppressing the processing load on the host computer side. A host computer acquires deformation information used to designate read addresses according to deformations of a scan line from a laser beam printer. A CPU (1) of the laser beam printer generates read addresses according to the deformation information to read out image data from a RAM, and transmits the readout image data to the laser beam printer. The laser beam printer (0) forms an image based on the image data received from the host computer (3000).

Abstract: A method is provided for compensating two-dimensional images for non-uniformity variations in the illumination of a document, or a scene, that is acquired by a digital camera. The invention can include a printer and/or a personal computer to perform some or all of the compensation calculations, if desired. The present invention captures initial image data, determines a region or area of that data having substantially, or somewhat, uniform pixel intensities and uses that as a background or border region. This border data is used to calculate correction data to correct or compensate the non-border pixel values for non-uniformities in the illumination of the image when it was first acquired, without needing a separate reference frame.

Abstract: A multicolor halftone image apparatus of the present invention includes halftone plates of a plurality of colors for reproducing a colored image, and each halftone is tilted with a relative screen angular difference of 30 degrees or 45 degrees in relation to at least one of the remaining halftones. For the preparation of the multicolor halftone, on the basis of a predetermined screen angle of a specific halftone, halftone dots are disposed in the specific halftone at a predetermined pitch. For each of the remaining halftones, a right triangle is defined such that its vertical angle is equal to a screen angel difference of 30 degrees or 45 degrees which the halftone has in relation to another halftone, and its two sides forming the vertical angle corresponds to screen angle directions of the two halftones.

Abstract: An input dither pattern determiner divides an input dither image to plural blocks, and determines an input dither pattern for each block. An output dither image portion converts the input dither pattern for each block to an output dither pattern. A reference emission time determiner portion determines a reference emission time for each block based on dark electric potential distribution and intermediate sensitivity distribution of a photoconductive drum, a light intensity distribution of a laser beam in a main scanning direction, and the output dither pattern. An area emission time calculator determines area emission time for each area based on a reference emission time for each block. An actual emission time calculator adjusts emission time for each area so that differences between reference emission times of blocks adjacent one another in the main scanning direction become a predetermined value or lower, and calculates actual emission time for each area.

Abstract: An index image consists of a plurality of thumbnail images arranged in a matrix array. The thumbnail images are produced from image data of a series of images. Where the images are recorded as RAW image data and other format image data within a series, an index image output apparatus superimposes a rectangular frame image of a particular color on each of those thumbnail images which are produced from the RAW image data, to produce a distinguishing thumbnail image. Then the index image include distinguishing thumbnail images and ordinary thumbnail images, so it is easy for the user to distinguish the RAW format images from other images of other formats.

Abstract: One embodiment of the present invention provides a system that generates a set of color-toning curves which can be used for color toning (or casting) a monochrome or color image. During operation, the system receives a first set of color-toning parameters for shadow regions, a second set of color-toning parameters for highlight regions, and an invariance property which needs to be maintained during color toning. The color-toning parameters specify the color that is to be applied to the shadows and highlights. Next, the system computes a set of color-toning-curve values and a set of color-toning-curve slopes using the first set of color-toning parameters, the second set of color-toning parameters, and the invariance property. The system then generates the set of color-toning curves using the set of color-toning-curve values and the set of color-toning-curve slopes.

Abstract: Toner transfer means is provided which is installed between a first stirring chamber and a second stirring chamber, which are provided respectively on an upstream side and a downstream side of a flow of toner which is stirred into a developer and charged in a process of transferring the toner from a toner retaining chamber to a photoreceptor drum, the toner transfer means controlling a toner density by transferring the toner from the first stirring chamber to the second stirring chamber, in order that: a weight percentage of the toner relative to a developer in the first stirring chamber is equal to or less than a first threshold value governing time involved in uniformly charging the toner; and a weight percentage of the toner relative to the developer in the second stirring chamber is (i) greater than the first threshold value and (ii) equal to or less than a second threshold value necessary for eliminating uncharged toner in the second stirring chamber.

Abstract: A display apparatus that displays an image includes: an image converting unit converting a photographed image signal, which is an image signal from a photographing unit that photographs an object, into a high-quality image signal of an image higher in quality than an image corresponding to the photographed image signal according to an arithmetic operation between the photographed image signal and a tap coefficient obtained by learning performed in advance; and a display control unit causing a display to display the image corresponding to the high-quality image signal in a display format determined by learning performed using an image higher in quality than the image corresponding to the high-quality image signal.

Abstract: An image forming method and a charged particle beam apparatus suitable for suppressing the inclination of charging when scanning a two-dimensional area with a charged particle beam. A third scanning line located between a first scanning line and a second scanning line is scanned. After the first, second and third scanning lines have been scanned, a plurality of scanning lines are scanned between the first and third scanning lines and between the second and third scanning lines.

Abstract: A multifunction device achieves a device function by appropriately combining plural elemental functions including a scanning function, a printing function, and a communication function. The multifunction device includes: a service layer for executing the plural elemental functions; an API table storage section which stores an API table in which a first API for executing the device function is associated with a second API that the service layer can receive; and an Open I/F layer which receives the first API, specifies, in the API table, the second API corresponding to the first API, and outputs the specified second API to the service layer. With this arrangement, it is possible to provide a multifunction device which allows new control from a control device to the multifunction device to be easily developed.

Abstract: An image processing apparatus capable of regulating memory increase to realize cost reduction while securing the degree of freedom in programming by means of a small-sized programmable data processing section, and thereby improving processing performance. A programmable data processing section comprises two processing sections capable of performing different processings simultaneously. Each of the processing sections repeatedly executes the steps of: reading image data from an image data storage section; reading mutually different processing programs from a processing program storage section; executing a predetermined processing in parallel on the image data; and returning the processed image data to the image data storage section.

Abstract: Provided are a scanning module and an image reading apparatus having the same. An alignment unit that can align positions of an image sensor and its tilt angles with regard to five degrees of freedom when a coupling position of an alignment member to a frame and a coupling position of a base plate to the alignment member are controlled, is provided, the image sensor can be aligned regardless of whether or not the production of the scanning module is completed, an alignment process is facilitated, and a manufacturing cost is reduce.

Abstract: A compensation apparatus for image scan, applied to an optical scanner with a platform, on which an object to be scanned is disposed. The optical scanner has a photosensitive apparatus with a set of scan photosensitive devices and a storage apparatus. When the object is scanned by the set of scan photosensitive devices, a scanned image is obtained and saved in the storage apparatus temporarily. The compensation apparatus has a set of calibration boards, a set of calibration photosensitive devices and an image processor. The set of calibration boards has two calibration boards located at two sides of the platform. The set of calibration photosensitive devices is located at two sides of the set of scan photosensitive device. The image processor is used to extract and compare the calibrated image, so as to adjust the scanned image.

Abstract: An image reading apparatus with an alignment unit is provided. The image reading apparatus includes a main body, a roller having a rotation shaft supported by a bushing to be disposed substantially parallel to a main scanning direction, and a scanning module facing the roller. An alignment unit is guided by the rotation shaft to align the scanning module. Accordingly, location accuracy of the roller is improved, exact alignment is possible, and the number of components is reduced because the alignment unit is formed integrally with the scanning module.

Abstract: An image processing device and an image processing method thereof are provided. The image processing device includes an optical module and a processing unit. The optical module includes several original light sources and a sensing unit. The image processing method includes the following steps. Firstly, a target color is set. Next, in a retrieving process, several original lights are projected on an article according to the target color, and the total quantities of the original lights are controlled to form several corresponding optical signals. After that, the optical signals are sensed to generate several electric signals. Lastly, a target gray-scale image data is obtained according to the electric signals.

Abstract: An assembly for transferring information to and/or from flexible sheet media in a highly advantageous curved configuration is disclosed. The sheet material includes a length and a width defining first and second opposing surfaces. The assembly includes support means for supporting the sheet the curved configuration across its width, having the first surface inwardly oriented with respect to the curved configuration. Thereafter, moving means moves the flexible sheet material so supported in a direction along a read/write path generally parallel to the sheet material length and transverse to the direction of curvature. A read/write arrangement is provided which is configured for reading and/or writing information across the width of the first surface of the sheet as the sheet is moved along the path in the curved configuration.

Abstract: According to one aspect of this disclosure, a printing apparatus and method is provided. The printing apparatus comprising a media sheet first inverter and a media sheet second inverter, the first inverter and second inverter operatively connected to provide a media sheet pass-through route, wherein the media sheet pass-through route transports a media sheet through the first inverter and the second inverter. According to another aspect of this disclosure, a printing system is disclosed. The printing system comprising an inverter module. The inverter module comprising a first media sheet input/output zone, and a second media sheet input/output zone, the first and second media sheet input/output zones operatively connected to provide a media sheet pass-through route. The inverter module is configured to selectably route a media sheet to a printing device for image transfer and the inverter module is configured to invert a media sheet from the printing device media sheet output.

Abstract: A discrimination medium 10a includes a first double layered body 101 having a right-handed circular polarization polymer cholesteric liquid crystal layer 11 and a left-handed circular polarization polymer cholesteric liquid crystal layer 12 which are stacked. The right-handed circular polarization polymer cholesteric liquid crystal layer 11 reflects a specific right-handed circular polarization light, and the left-handed circular polarization polymer cholesteric liquid crystal layer 12 reflects a specific left-handed circular polarization light. The discrimination medium 10a is applied to the article 30, and is viewed via a simple determination tool 20 having a filter 21 allowing only right-handed circular polarization light to pass therethough and a filter 22 allowing only left-handed circular polarization light to pass therethough.

Abstract: An optical relay includes a first lens, a lens module, and a second lens. The first lens is configured to receive modulated light from a first spatial light modulator. The first lens is configured to refract the modulated light into the lens module. The lens module is configured to collimate and focus the modulated light into the second lens. The second lens is configured to refract the modulated light onto a second spatial light modulator.

Abstract: A display system includes and image-guiding substrate with input and/or output structures configured to improve image quality.

Abstract: An optical scanning unit includes: a light source configured to emit a light beam; a lens arranged so that the light beam emitted from the light source passes therethrough; a rotatable deflector configured to deflect the light beam coming from the lens, the deflected light beam being guided to a light receiving member; a movable lens holder configured to hold the lens, the lens holder being provided in a space between the light source and the deflector; a support member having a first face located on a first side thereof, the first face facing toward a vertically-downward direction and extending in a direction substantially parallel to a reference-axis defined between the light source and the deflector, there also being a second face located on a second side, the second face being arranged opposite to the first face; and a force-transferring member configured to transfer a force to the lens holder for moving the lens holder along the first face of the support member, the force being applied to the force-trans

Abstract: According to an aspect of the invention, there is provided a scanning device, which is provided with a light source unit that emits a light beam, a collection optical system that converges the light beam emitted by the light source unit principally in an auxiliary scanning direction, a deflector that deflects the light beam converged by the collection optical system, an image forming optical system that converges the light beam deflected by the deflector onto a scan target surface to form a beam spot scanning in a main scanning direction which is perpendicular to the auxiliary scanning direction.

Abstract: An imager comprising a photosensitive surface; a light source which produces at least one scaning light beam; a deflector, arranged to deflect the at least one scanning light beam onto the photosensitive surface; and a sensor which measures the orientation of the deflector. The imager also comprises a controller operative to determine a placement error of said at least one scanning beam on the photosensitive surface, responsive to the orientation measurement by the sensor; and an actuator, responsive to the displacement error, and arranged to change the direction of deflection of the at least one light beam by the deflector. The sensor is configured to measure the orientation of the deflector substantially at a null in a vibrational mode of the deflector.

Abstract: The present invention is directed to a motor-operated optical shutter for opening and closing the illumination beam path in optical devices. The optical shutter, according to the invention, for the illumination beam path in optical devices comprises a mounting unit which is provided with a diaphragm aperture, a stepper motor which is mounted at the mounting unit, and a shutter element which is connected to the motor shaft of the stepper motor for opening and closing the diaphragm aperture. A two-phase stepper motor with a large full step angle is preferably used. The two-phase stepper motor is connected to a control unit and carries out the required movement of the shutter element at a short distance from the motor shaft. The solution according to the invention provides a very economical and simple optical shutter for optical devices.

Abstract: A switchable transflector (1) comprises a suspended particle device (SPD). The transflector (1) may be switched into transmissive, reflective or intermediate states by applying one or more electric fields to a particle suspension (2). An enhanced reflectivity state may be achieved by applying two mutually orthogonal electric fields simultaneously. An intermediate state may be achieved by applying a non-saturating electric field or by applying two or more electric fields alternately according to a timing scheme. The transflector (1) may be maintained in a given state by applying voltage pulses at intervals less than a relaxation time associated with the SPD 1. The transmittance and reflectance properties of the transflector (1) may be tuned in accordance with the output of a light sensor (14). The transflector (1) may be incorporated in a transflective display (15)which comprises a display device, such as an LCD (16).

Abstract: Improved apparatus and methods for spatial light modulation are disclosed which utilize optical cavities having both front and rear reflective surfaces. Light-transmissive regions are formed in the front reflective surface for spatially modulating light.

Abstract: The 2-channel display system with micro electromechanical systems (MEMS, e.g. DMDs from Texas Instruments) simultaneously generates a right and a left image in two discrete modulation channels, which differ by the polarization of their light beams. More specifically, the invention relates to the chirality (handedness) of MEMS and the geometric problems associated with this handedness in superposition systems. In this application we uncover a solution to superpose the images modulated by identical MEMSs (imagers of the same isomer type) without additional mirroring.

Abstract: An electrophoretic sheet, comprises: a substrate having a first side; a microcapsule contained layer having a second side and a third side facing the second side, the second side being disposed on the first side of the substrate, the layer including: a microcapsule; and a binder having viscid property at normal temperature and holding the microcapsule, the microcapsule including: a shell; an electrophoretic dispersion liquid included in the shell; and at least one electrophoretic particle included in the electrophoretic dispersion liquid.

Abstract: Data 12010, 12020, etc. to be sent to each of client devices 1201, 1203, etc. from a data server device 1000 are, in a data communication unit 1100, first divided into electric signal packets by a data transmission/receipt control unit 1140, whereby an electric signal sequence tag is added to each electric signal packet, then converted into optical packets 12011, 12021, etc. by an optical signal transmitting unit 1120, and transmitted through an optical signal path 1110. At optical switch 1101, the optical paths of the packets are switched to optical signal paths 1111, 1112, etc. by the actions of optical destination tags 12111, 12121, etc. that are respectively synchronized with optical packets and irradiated by an optical signal transmitting unit 1120. At optical signal receiving units 1131, 1132, etc., the received optical packets are converted to electric signal packets, and reassembled to be original data 12010, 12020, etc.

Abstract: The present invention relates to a frequency shifter in an optical path containing a pulsed laser source, and it is characterized in that it comprises at least one frequency shifter (12, 13) containing an optical propagation medium, the optical path length of which is modified according to the desired frequency shift during at least one pulse among n consecutive pulses from the laser, where n?1.

Abstract: A welding mask comprising a face shield for at least partially covering the face of a user. The face shield has a viewing portion made of opaque translucent material. The opaque material provides for high-intensity visible light associated with welding to be visible therethrough. Also disclosed herein is welding mask assembly comprising a principle mask as described above with either a protective outer layer or mask mounted thereto or an inner mask or shield mounted on the underside thereof or having both of the foregoing mounted thereto.

Abstract: A telescope has an optical axis. As seen from an object side, there are provided along the optical axis an objective lens, two lens groups adapted to be shifted along the optical axis independently from one another and having together a variable magnification, an inversion system, and an eyepiece. An aperture stop is provided between the lens groups, and the aperture stop is adapted to be shifted along the optical axis as a function of the axial position of the lens groups.

Abstract: A partially or fully automated microscope includes one or more configurable subassembly Each subassembly has at least one element. The element can be configured in various positions. A computer, associated with the microscope and having an input device and display, also includes a database configured to store configurations of the element for the subassembly.

Abstract: A specimen imaging apparatus is provided that is capable of improved high-speed operation compared to conventional apparatuses. The specimen imaging apparatus is provided with a microscope for enlarging the image of a specimen, and taking the enlarged image of the specimen obtained by the microscope. The apparatus is provided with a vibration detecting means for detecting a relative vibration between the objective lens of the microscope and the specimen mounted n the microscope, a means for focusing before the vibration detected by the vibration detecting means has attenuated to less than a predetermined value, and a determining means for determining whether or not a vibration detected by the vibration detecting means is less than a predetermined value. The specimen imaging apparatus is configured so as to take the enlarged image of a specimen when the determining means has determined that the vibration is less than a predetermined value.

Abstract: In a scanning microscope, slides are fed automatically from a magazine to the imaging system. Each slide is labeled in some fashion with information for selecting the appropriate modality of operation of the scanner for that slide and the modality is implemented automatically. The information is preferably tied to and defined by a laboratory information system (LIS). For example, the instructions may regard the type of microscopy (i.e., trans- or epi-illumination), multi-spectral imaging with particular spectral bands combined with a particular set of z-positions, alternative filters, settings for the numerical aperture of the condenser, alternative detector operation for different resolutions, and alternative post-scan analyses of the data, as deemed optimal for the scan. The label may also contain the slide's identity, a pathologist's name, desired post-scan handling protocol, etc. The preferred array microscope to carry out the invention is also described.

Abstract: Arrangement for changing the uncoupling of the object beam and/or the coupling of the beam in a Laser Scanning Microscope, whereby a rotatable tube revolver is provided, which has at least four switching positions and each tube position is associated with a separate tube lens as well as deflecting elements for the object beam, whereby the tube positions for at least the LSM operation, LSM/NDD and/or manipulation and/or illumination, camera and visual operation modes are provided.

Abstract: A microscope with a first and a second illumination light beam for illuminating a sample, wherein the first and/or the second illumination light beam evanescently illuminates the sample. For the purpose of CARS testing, the first illumination light beam can be a pump light beam, and the second illumination light beam can be a Stokes light beam. To increase resolution, the first illumination light beam can be an excitation light beam, and the second illumination light beam can be a stimulation light beam.

Abstract: A light diffusing screen for a single light source-type rear projection television, for use in combination with a Fresnel lens sheet, which can reduce scintillation and, regulate the surface roughness of the screen and provide good images. The light diffusing screen includes: a lens layer which can horizontally refract projected light; and a light diffusing layer provided on a light outgoing side as compared with the lens layer. The light diffusing layer includes a light transparent matrix and light diffusing fine particles formed of a light transparent material dispersed in the light transparent matrix. The light diffusing layer has a multilayer structure of which the outermost layer on the light outgoing side of the light diffusing layer is a layer which diffuses light most strongly, the outermost surface layer on the light outgoing side in the light diffusing screen having a surface roughness Ra of 0.2 ?m?Ra?1.0 ?m.

Abstract: A Fresnel lens sheet which is bright due to a small light quantity loss, is restricted in speckles and ghosts, does not produce moires, and can be used in an inexpensive transmitting screen, wherein the sheet satisfies the diffusion characteristics of the following expressions (1) and (2), or the following expressions (3), (4) and (5). ?/??2.8 (1) ?/??6 (2), where ? is viewing half value angle, ? viewing 1/10 value angle, and ? viewing 1/100 value angle. 2.0°???5.5° (3), where ? is viewing half value angle, ??12° (4), where ? is viewing 1/10 value angle, ??18° (5), where ? is viewing 1/100 value angle.

Abstract: Polarization beam splitters (P1, P2, P3, P4) are coupled in pairs along optical axes such that their planes of polarization are perpendicular. Said complementarity P1/P2, P1/P3, P4/P2, P4/P3 enables reciprocal coupling of a polarizing transmission to a polarizing reflexion for both partial beams. During cross-polarization, two complementarily linear polarized partial beams occur, which have the same high polarization quality and the same intensity, both being symmetrically folded. During cross-superpositioning the reverse is the case. Each of the two partial beams which are to be superposed are combined by transmission and reflexion by mutually complementary polarizers into a common axis. Coupling of cross-polarizers results in efficient arrangements of systems which operate with complimentarily polarized radiation, e.g. 2-channel image display systems with polarization-rotating reflective spatial light modulators RLM1 and RLM2.

Abstract: A system for converting the polarization state of an optical beam which propagates along a path from an initial polarization state into an inhomogeneous polarization state includes a first isotropic material and a first anisotropic material. The first anistropic material is positioned adjacent to the first isotropic material in a substantially transverse manner relative to the path of the optical beam. The first anisotropic material has a first alignment axis that produces one of a radially, azimuthally, and counter-rotationally polarized optical beam when substantially aligned with respect to a polarization axis of the optical beam.

Abstract: A surveillance window including at least one set of linear polarizer and quarter-waveplate and a reflecting surface. The surveillance window appears dull and opaque to a subject, while allowing a relatively high percentage of light to be transmitted to an observer. Various enhancements including an illuminator and detector, camouflaging, fire resistance, and improvements to the opacity are also described.

Abstract: An object of the present invention is to provide a retroreflective sheeting that exhibits proper retroreflection even at a small incident angle with no or less halation, and has superior incident angularities and superior direction characteristics, as well as a film for use in the retroreflective sheeting. The retroreflective sheeting with the above characteristics is obtained by forming reflective elements of a specific triangular pyramidal frustum configuration in a close-packed state on one surface thereof.

Abstract: An antireflection film is disposed on a surface of an optical substrate, and consists of first to tenth layers to stacked sequentially from the opposite side to the optical substrate. The first layer, the fourth layer and the ninth layer are low-refractive index layers made of a low-refractive index material exhibiting a refractive index of 1.35 to 1.50 with respect to the d-line. The third layer, the fifth layer, the seventh layer and the tenth layer are intermediate-refractive index layers made of an intermediate-refractive index material exhibiting a refractive index of 1.55 to 1.85 with respect to the d-line. The second layer, the sixth layer and the eighth layer are high-refractive index layers made of a high-refractive index material exhibiting a refractive index that is in a range from 1.70 to 2.50 with respect to the d-line, and that is higher than the refractive index of the intermediate-refractive index material.

Abstract: An antireflective member according to the present invention has an uneven surface pattern, in which unit structures are arranged in x and y directions at respective periods that are both shorter than the shortest wavelength of an incoming light ray, on the surface of a substrate and satisfies the following Inequality (1): ? ? ? ? x , y ? min < 1 ni + ni · sin ? ? ? ? ? ? ? i max ( 1 ) where ?min is the shortest wavelength of the incoming light ray, ?imax is the largest angle of incidence of the incoming light ray, ni is the refractive index of an incidence medium, ?x is the period of the uneven surface pattern in the x direction, and ?y is the period of the pattern in the y direction. As a result, diffraction of short-wave light components can be reduced in a broad wavelength range.

Abstract: A diffuser plate with higher light diffusion efficiency and brightness applied to backlight module of Liquid Crystal Display TV (LCD TV) for providing uniform light is disclosed. An optical lens with a diffusion layer is disposed on one side of the substrate. The diffusion layer is arranged above the optical lens for enhancing diffusion effect. The other side of the diffuser plate can be a plane or having a lens structure. By Lenticular lens, the homogeneity of emitted light is improved so as to reduce the amount of diffusion particles being added into the diffusion plate Therefore, the light transmission is increased and the brightness is enhanced. Meanwhile, ability of shielding lamps is considered and Moiré effect is eliminated. Moreover, the diffusion layer is co-extruded on surface of the Lenticular lens together with the substrate so that the device is easy to be produced.

Abstract: The present invention relates to an apparatus for illuminating and inspecting a specular surface, comprising a light source, a collector optics for collecting the light from the light source, a homogenizing optics for transmitting the light from the collector optics having a first micro-lens array downstream of the collector optics, and a second micro-lens array downstream of the first micro-lens array, a Fourier optics for transmitting the light from the homogenizing optics onto the specular surface, an objective optics, and a detector for receiving an image, wherein the collector optics and the first micro-lens array project the light source onto the second micro-lens array and wherein the second micro-lens array and the Fourier optics project the first micro-lens array onto the specular surface, and wherein the objective optics projects the specular surface onto the detector.

Abstract: A fast, electro-optically switched zoom lens system operates across a broad spectral and thermal range while correcting for birefringent aberrations by means of a polarizing system that preferably includes polarizing reticles.

Abstract: The invention relates to a pickup unit (1) for reading and/or writing data on a disk (2). The pickup unit (1) comprises a lens (5) in a lens holder (6) which is connected to a frame (7) of the pickup unit (1) by a plurality of elastic support members (8). The lens holder (6) is movable with respect to the disk (2) by bending of the elastic support members (8). The mounting position (9) of each elastic support member (8) at the lens holder (6) is located closer to the disk (2) than the respective mounting position (10) of the elastic support member (8) at the frame (7), as seen in the focusing direction of the lens (5). In this manner the lens holder (6) with the lens (5) is adapted to be brought to an operating distance with respect to the disk (2) which is smaller than the flatness tolerances of the disk (2) without the risk of collisions between the frame (7) and the rotating disk (2).