Abstract: A projection lens (46) comprises: a cylindrical exterior case (621) having a lens-shifting through-hole (625) on a side thereof and an inner circumferential step or inner flange (623); a lens (610) of which outer periphery (611) on a first side is abutted to the inner circumferential step or inner flange (623); a flexible or elastic spacer (660) abutted to an outer periphery (612) of a second side of the lens (610); and a retainer (670) holding the spacer (660), where the lens (610) is fixed on the exterior case (621).

Abstract: A lens evaluation method for calculating resolution evaluation value based on a detected luminance value in order to evaluate resolution of lens has a background luminance value acquiring step for acquiring a luminance value at a background part having no test pattern formed thereon, a maximum luminance value acquiring step for acquiring maximum luminance value in the test pattern image, a minimum luminance value acquiring step for acquiring minimum luminance value and an evaluation value calculating step for calculating a resolution evaluation value based on the luminance values obtained in the respective steps.

Abstract: A projection lens has a lens barrel in which group lenses are sequentially disposed and an optical path is set, the lens barrel having position-adjusting holes on a position orthogonal to an optical axis of a third group lens and being orthogonal with each other. The projection lens manufacturing apparatus has a projection lens holding mechanism for holding the projection lens at the lens-adjusting position; an image light irradiating mechanism which introduces the test pattern image in accordance with a light beam irradiated by a light source onto the projection lens; a lens position adjuster which adjusts the position of the third group lens along X-axis and Y-axis while detecting the image light irradiated through the projection lens; and a bonding mechanism for bonding the adjusted third group lens.

Abstract: A lens evaluation method for calculating resolution evaluation value based on a detected luminance value in order to evaluate resolution of lens has a background luminance value acquiring step for acquiring a luminance value at a background part having no test pattern formed thereon, a maximum luminance value acquiring step for acquiring maximum luminance value in the test pattern image, a minimum luminance value acquiring step for acquiring minimum luminance value and an evaluation value calculating step for calculating a resolution evaluation value based on the luminance values obtained in the respective steps.

Abstract: A lens evaluation method for calculating resolution evaluation value based on a detected luminance value in order to evaluate resolution of lens has a background luminance value acquiring step for acquiring a luminance value at a background part having no test pattern formed thereon, a maximum luminance value acquiring step for acquiring maximum luminance value in the test pattern image, a minimum luminance value acquiring step for acquiring minimum luminance value and an evaluation value calculating step for calculating a resolution evaluation value based on the luminance values obtained in the respective steps.

Abstract: A method for evaluating the quality of a lens comprising illuminating imaging light on a screen through the lens to form a projected image, where the imaging light having a test-pattern image is generated using a test sheet on which a test pattern for measuring a resolution of the lens is formed to evaluate the resolution of the lens; detecting a brightness of the test-pattern image displayed on the screen by an image-capturing device using an imaging sensor; calculating an input level on the basis of the detected brightness of the test-pattern image; and calculating an evaluated value of resolution. The method, further comprises adjusting a position of the test sheet to a position corresponding to a focus of the lens by detecting the test-pattern image while moving the test sheet back and forth in the direction along an optical axis of the lens.

Abstract: A projection lens (46) has a lens barrel (100) in which group lenses (110) are sequentially disposed and an optical path is set, the lens barrel (100) having position-adjusting holes (122A) on a position orthogonal to an optical axis of a third group lens (113) and being orthogonal with each other. The projection lens manufacturing apparatus has a projection lens holding mechanism (550) for holding the projection lens (46) at the lens-adjusting position; an image light irradiating mechanism (526) which introduces the test pattern image in accordance with a light beam irradiated by a light source (521) onto the projection lens (46); a lens position adjuster (570) which adjusts the position of the third group lens (113) along X-axis and Y-axis while detecting the image light irradiated through the projection lens (46); and a bonding mechanism (580) for bonding the adjusted third group lens (113).

Abstract: The present invention relates to a display apparatus, a marker signal making process, a marker signal detector circuit, and a control signal generator circuit that are suitable for use when making a display in which a display screen is divided into a plurality of areas and images whose picture qualities are different at every area are displayed. Thus, in the present invention, image signals (R/G/B) from input terminals 1R, 1G, 1B are supplied to a preamplifier IC 3, e.g. to respective sharpness improving circuits 32R, 32G, 32B therein. Image signals derived from the preamplifier IC 3 are subjected to DC voltage conversion by a cutoff adjusting amplifier 6 and then supplied, e.g. to a cathode ray tube 7 as a display means. A microcomputer 40 which is present within this apparatus and controls various kinds of functions forms first and second DC voltage data for controlling, e.g. the sharpness.

Abstract: A projection lens (46) comprises: a cylindrical exterior case (621) having a lens-shifting through-hole (625) on a side thereof and an inner circumferential step or inner flange (623); a lens (610) of which outer periphery (611) on a first side is abutted to the inner circumferential step or inner flange (623); a flexible or elastic spacer (660) abutted to an outer periphery (612) of a second side of the lens (610); and a retainer (670) holding the spacer (660), where the lens (610) is fixed on the exterior case (621).

Abstract: A method for evaluating the quality of a lens has the steps of: illuminating imaging light on a screen through the lens to form a projected image, where the imaging light having a test-pattern image is generated using a test sheet on which a test pattern for measuring a resolution of the lens is formed to evaluate the resolution of the lens; detecting a brightness of the test-pattern image displayed on the screen by an image-capturing device using an imaging sensor; calculating an input level on the basis of the detected brightness of the test-pattern image; and calculating an evaluated value of resolution. In the method, furthermore, there is provided the step of adjusting a position of the test sheet to a position corresponding to a focus of the lens by detecting the test-pattern image while moving the test sheet back and forth in the direction along an optical axis of the lens is further comprised.

Abstract: There is provided a print head device which is capable of mounting an ink cartridge therein with a small mounting force without spoiling the sealing performance of a seal packing and minimizing the deformation of a contact portion of the seal packing where the ink cartridge is brought into contact, and an ink jet printer incorporating the print head device. The print head device includes a print head unit, an ink cartridge removably mounted in the print head unit, and a seal packing. The print head unit has an ink jet print head, and an ink reception block for receiving supply of ink. The ink cartridge is removably mounted in said print head unit, and has an ink delivery block for delivering ink therefrom. The seal packing has a generally hollow cylindrical shape and arranged between said ink delivery block of said ink cartridge and said ink reception block of said print head unit.

Abstract: There is provided an ink cartridge device which permits a delivery port-sealing film thereof to be positively peeled off and prevents ink from scattering out of the device during an operation for peeling off the delivery port-sealing film. An ink cartridge has an ink delivery port for supplying ink to the printer therefrom, and a rim of the ink delivery port. A container box contains the ink cartridge and has a box body and a lid for closing the box body. The box body is formed with a slit. A delivery port-sealing film has a sealing portion removably welded to the rim of the ink delivery port, for sealing the ink delivery port, and an unsealing operation portion continuous with the sealing portion and extending in a direction of making a U-turn with respect to the sealing portion to extend out of the container box through the slit of the box body.

Abstract: A lens evaluation method for calculating resolution evaluation value based on a detected luminance value in order to evaluate resolution of lens has a background luminance value acquiring step for acquiring a luminance value at a background part having no test pattern formed thereon, a maximum luminance value acquiring step for acquiring maximum luminance value in the test pattern image, a minimum luminance value acquiring step for acquiring minimum luminance value and an evaluation value calculating step for calculating a resolution evaluation value based on the luminance values obtained in the respective steps.

Abstract: There is provided an ink cartridge device which permits a delivery port-sealing film thereof to be positively peeled off and prevents ink from scattering out of the device during an operation for peeling off the delivery port-sealing film. An ink cartridge has an ink delivery port for supplying ink to the printer therefrom, and a rim of the ink delivery port. A container box contains the ink cartridge and has a box body and a lid for closing the box body. The box body is formed with a slit. A delivery port-sealing film has a sealing portion removably welded to the rim of the ink delivery port, for sealing the ink delivery port, and an unsealing operation portion continuous with the sealing portion and extending in a direction of making a U-turn with respect to the sealing portion to extend out of the container box through the slit of the box body.

Abstract: A display apparatus in which a marker signal created by combining primary color signals of predetermined levels in an arbitrary pattern and designating a specified area of a screen is detected, the screen is divided into a plurality of areas and a display formed of an image different in picture quality is present at each one of the plurality of areas, a control signal for suppressing the luminance of the marker signal is generated, to thereby make the marker signal inconspicuous.

Abstract: There is provided an ink cartridge device which permits a delivery port-sealing film thereof to be positively peeled off and prevents ink from scattering out of the device during an operation for peeling off the delivery port-sealing film. An ink cartridge has an ink delivery port for supplying ink to the printer therefrom, and a rim of the ink delivery port. A container box contains the ink cartridge and has a box body and a lid for closing the box body. The box body is formed with a slit. A delivery port-sealing film has a sealing portion removably welded to the rim of the ink delivery port, for sealing the ink delivery port, and an unsealing operation portion continuous with the sealing portion and extending in a direction of making a U-turn with respect to the sealing portion to extend out of the container box through the slit of the box body.

Abstract: An ink cartridge device includes an ink cartridge and a cartridge casing. The ink cartridge has a first surface formed with an ink delivery port, a second surface formed with an air inlet port, a delivery port-sealing film for sealing the ink delivery port, and an air inlet port-sealing film for sealing the air inlet port. The cartridge casing has a casing body and a lid for closing the casing body. The cartridge casing accommodates the ink cartridge. At least one of the delivery port-sealing film and the air inlet port-sealing film comprises an unsealing operation portion for opening the at least one of the delivery port-sealing film and the air inlet port-sealing film, the unsealing operation portion being fixedly attached to an inner surface of the cartridge casing.

Abstract: There is provided an ink cartridge which prevents ink from spilling out when the ink cartridge is mounted in a printer. An ink supply block of the ink cartridge is formed with a delivery port opening in a bottom of the ink supply block and a supply passage extending inward from the delivery port. A filter is provided at an upstream end of the supply passage. A lid member, which has a complementary shape to the supply passage, is removably mounted in the supply passage from the delivery port.

Abstract: A printhead unit is detachably coupled to an ink cartridge. The printhead unit includes an ink passage and a damper member for absorbing a pulsation of ink in the ink passage. The damper member permits the forces created when the ink cartridge receives an impact to be absorbed rather than translated through to the printhead, thereby destroying the meniscuses in the nozzles.

Abstract: An ink cartridge and a method of disassembling the ink cartridge are provided. A casing body has a bottom formed with an ink delivery port extending therethrough. A casing lid joined to the casing body is formed with an air inlet port extending therethrough. The casing body and the casing lid forms a cartridge casing. The cartridge casing is filled with an ink-absorbent material. A delivery port-sealing film seals the ink delivery port. An air inlet port-sealing film seals the air inlet port. A filter is arranged within the casing body at a location inward of the ink delivery port by being inserted thereto from an ink-absorbent material side such that the filter is located between the ink delivery port and the ink-absorbent material. The casing body, the casing lid, the delivery port-sealing film, and the air inlet port-sealing film are formed of a resin material of the same kind.