JP2006003445A - Rear projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rear projector improved to eliminate variance in mass production by making each set of the rear projector have the degree of freedom in the positional adjustment of an image line in an up-and-down direction and realizing the accurate positional adjustment of the image line with simple constitution. <P>SOLUTION: The rear projector comprises an optical unit 3 for modulating luminous flux emitted from a light source and forming an optical image in accordance with image information and a screen 6 where the optical image is enlarged and projected by a projection lens 4, and a cabinet 1 for housing them. The optical unit 3 has a boss for support 7 turnable in the up-and-down direction of the image line projected to the screen 6, and an adjuster block 10 having an inclined surface is moved to advance/retreat by the rotating operation of an adjusting screw, whereby the optical unit 3 and the projection lens 4 are turned with the boss for support 7 as a fulcrum, and the image line is adjusted in the up-and-down direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rear projector that displays an image on a transmissive screen, and more specifically, it enables high-precision image line adjustment by providing a degree of freedom of image line position adjustment for each set of rear projectors. .

  In a rear projector with a transmissive screen, a slight shift in the vertical position of the image line of the projection lens results in a large shift in the image line position in the image that is magnified by the projection lens and projected onto the screen. The adjustment of the vertical position of the image line is very important.

Conventionally, as a technology of a rear projector provided with an image line position adjusting mechanism as described above, after the rear projector is assembled, a tension member such as a spacer is attached to the center of variation in mass production on the optical unit or the mounting base. The line was adjusted. As another method, a technology of a rear projector provided with an image line position adjustment mechanism has been proposed. (For example, refer to Patent Document 1).
JP 2003-337379 A

  However, as described above, if the optical unit or the mounting base has a spacer such as a spacer at the center of the mass production variation, prepare a tensioner having different dimensions according to the mass production variation after the rear projector is assembled. Therefore, there is a problem that the adjustment of the image line position becomes complicated. Moreover, since the technique of Patent Document 1 has a complicated adjustment mechanism, there is a problem that it takes time to adjust the image line position.

  The present invention has been made in order to solve the above-described problems, and provides a degree of freedom in adjusting the vertical image line position for each set of rear projectors. It is an object to obtain a rear projector that can be adjusted and eliminates the variation in mass production.

In order to solve the above problems and achieve the object of the present invention, a rear projector according to claim 1 of the present invention modulates a light beam emitted from a light source and forms an optical image according to image information. An image forming unit including a projection optical system for enlarging and projecting an apparatus and an optical image by a projection lens, an optical unit housing for housing the optical device, an outer housing for housing the optical unit housing and the projection lens, and an image forming unit A rear projector comprising a screen for projecting an optical image formed in
The optical unit housing and the projection lens are integrated, and the optical unit housing has a support portion that can be rotated in the vertical direction of the image projected on the screen, and the optical unit housing and The image forming apparatus includes an image line position adjusting unit including an adjuster member having an inclined surface that moves forward and backward so that the projection lens can rotate in the vertical direction of the image line.

  In the rear projector according to the second aspect, the support portion of the image line position adjusting means is disposed in the vicinity of the projection lens of the optical unit casing.

  According to a third aspect of the present invention, the rear projector includes an adjuster block in which an adjuster member is disposed at the rear end of the bottom surface of the optical unit housing and moves forward and backward by rotating the adjusting screw.

  According to a fourth aspect of the present invention, a rear projector includes a cushion member that biases the optical unit housing toward the adjuster member.

  Further, in the rear projector according to claim 5, the image line position adjusting means is adjusted to a predetermined image line position by selectively aligning stepwise different gauge surfaces provided in the outer casing with the reference surface. It is what is done.

  According to the rear projector of the first aspect of the present invention, it is possible to adjust the projected image line position with high accuracy only by performing the advance / retreat operation of the adjuster member.

  According to the rear projector of the second aspect of the present invention, the support portion of the image position adjusting means is disposed in the vicinity of the projection lens of the optical unit casing, so that the adjuster member can be moved forward and backward slightly. The vertical position of the image line can be adjusted.

  In the rear projector according to claim 3 of the present invention, the adjuster member is disposed at the rear end portion of the bottom surface of the optical unit casing, and is composed of an adjuster block that moves forward and backward by rotating the adjusting screw. The image vertical position can be adjusted with the configuration.

  According to the rear projector of claim 4 of the present invention, the optical unit housing is provided with the cushion member that urges the adjuster member toward the adjuster member, so that the optical unit housing is adjusted by the repulsive force of the cushion member. The vertical position of the image line can be adjusted stably without the optical unit housing rattling.

  According to the rear projector of the fifth aspect, by selectively aligning the gauge surface with the reference surface, it can be easily adjusted to a predetermined image line position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out a rear projector according to the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing the overall internal configuration of the rear projector.

  A cabinet 1 constituting an outer casing of the rear projector has a bottom cabinet 2 at the lower end. An optical unit 3 that modulates a light beam emitted from a light source (not shown) and forms an optical image according to image information, and a projection lens 4 that magnifies and projects the optical image from the optical unit 3 are provided in the lower part of the cabinet 1. Has been placed. The optical image enlarged and projected from the projection lens 4 is reflected by the reflection mirror 5 disposed obliquely in the cabinet 1 and projected onto the screen 6 on the front surface of the cabinet 1.

  FIG. 2 is an enlarged side view of the optical unit 3 and the projection lens 4. The optical unit 3 and the projection lens 4 are integrally formed as a unit, but the optical unit 3 and the projection lens 4 are partitioned by a partition wall 1 a of the cabinet 1. The optical unit 3 is disposed in the partition wall 1a, while the projection lens 4 is disposed outside the partition wall 1a, that is, at a position diagonally facing the reflection mirror 5. The supporting bosses 7 and 7 and the projection lens 4 are supported on the partition wall 1a by a supporting portion described later.

  It is the figure which looked at the partition wall 1a in FIG. 3 from the inner side. Supporting bosses 7, 7 having a pair of left and right screw holes are provided on the upper portion of the partition wall 1a, and a pair of positioning bosses 8, 8 are also provided below the supporting bosses 7, 7. The optical unit 3 is fixed to the supporting bosses 7 and 7 with screws 9 and 9 (see FIG. 2). The positioning bosses 8 and 8 are engaged with a groove (not shown) of the optical unit 3 to position the optical unit 3 at a predetermined position.

  With this configuration, the optical unit 3 and the projection lens 4 can be moved up and down with respect to the cabinet 1 as indicated by white arrows with the supporting bosses 7 and 7 as fulcrums. That is, the projection lens 4 can be moved up and down in the direction of the image line position.

  Here, the image line position adjusting mechanism will be described. A member for adjusting the image line position is an adjuster block 10. The adjuster block 10 is located on the bottom cabinet 2 and is arranged so that the bottom surface of the rear end portion of the optical unit 3 is on the slope 11 provided on the top surface thereof.

  As shown in FIG. 4, the adjuster block 10 is supported by a support plate 12 disposed on the back side thereof. An adjustment screw support plate 13 adapted to give elasticity is fixed to the outside of the support plate 12 by a fixing screw 15 in a state where one end thereof is held in the holding groove 14. Then, the adjusting screw 16 is screwed into the boss type screw 17 formed in the adjuster block 10 through the adjusting screw support plate 13 and the support plate 12.

  A stepped gauge surface 18 is formed from the end of the adjuster block 10, and the gauge surface 18 is inserted into a slot 19 formed in the support plate 12. As shown in FIG. 5, for example, numbers are displayed on the step-like gauge surfaces 18 and numbers are also provided on the support plate 12 at positions corresponding to the numbers in order to make the numbers easy to read. It is attached.

  As a configuration associated with the image line position adjusting mechanism, a cushion material 20 is disposed between the upper surface of the optical unit 3 and the inclined partition wall 1b.

  The image line position adjusting mechanism is configured as described above, and the adjuster block 10 is moved forward and backward by rotating the adjusting screw 16 clockwise or counterclockwise, whereby the optical unit 3 moves the supporting boss 7. The partition wall 1a around the fulcrum is bent, and the size of the optical unit 3 tilting forward can be varied to adjust the image line position of the projection lens 4. That is, when the adjuster block 10 is entered, the projection lens 4 moves in the direction indicated by the optical axis a in FIG. 1, so that the projected image line can be raised, and the adjuster block 10 is retracted to allow the projection lens to move backward. 4 moves in the direction indicated by the optical axis b in FIG. 1, so that the projected image line can be lowered. By using such an image line position adjustment mechanism, it is possible to easily perform an accurate image line position adjustment with a simple configuration without variation in mass production of rear projectors.

  Further, the gauge surface 18 provided in a stepped shape on the adjuster block 10 serves as a standard for determining the image line position to be adjusted when adjusting the image line projected by the rear projector. . For example, when the image line is adjusted at the position of the numeral “2”, the gauge surface of the numeral “2” is aligned with the surface of the support plate 12 as the reference plane. Thereafter, when adjusting the image line in the production of the projector, the image line may be adjusted by matching the gauge surface with the number “2”.

Further, since the cushion material 20 is disposed between the upper surface of the optical unit 3 and the inclined partition wall 1b, the repulsive force of the cushion material 20 and the weight of the optical unit 3 are pressed against the inclined surface 11 of the adjuster block 10. Therefore, there is no backlash between the optical unit 3 and the adjuster block 10, thereby enabling a stable movement operation of the optical unit 3.

  The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

1 is an overall internal configuration diagram of a rear projector applied to the present invention. FIG. It is an enlarged view of the attachment state of an optical unit and a projection lens. It is a perspective view of the support boss and the positioning boss on which the optical unit is supported. It is a perspective view of the decomposition | disassembly state of the image line position adjustment mechanism which has an adjuster block. It is a perspective view of the gauge surface structure of image line adjustment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cabinet, 1a ... Partition wall, 3 ... Optical unit, 4 ... Projection lens, 5 ... Reflection mirror, 6 ... Screen, 7 ... Supporting boss, 10 ... Adjuster block, 11 ... Slope, 12 ... Support plate, 13 ... Adjustment screw support plate, 16 ... Adjustment screw, 17 ... Boss type screw, 18 ... Gauge surface, 20 ... Cushion material

Claims (5)

An optical device that modulates a light beam emitted from a light source and forms an optical image according to image information, an image forming unit that includes a projection optical system that magnifies and projects the optical image by a projection lens, and an optical that houses the optical device A rear projector comprising: a unit housing; an outer housing that houses the optical unit housing and the projection lens; and a screen that projects an optical image formed by the image forming unit,
The optical unit housing and the projection lens are integrated, and the optical unit housing has a support portion that is rotatable in the vertical direction of the image projected on the screen, and the support portion as a fulcrum. A rear projector comprising: an image line position adjusting means including an adjuster member having an inclined surface that moves forward and backward to enable the optical unit housing and the projection lens to rotate in the vertical direction of the image line.   The rear projector according to claim 1, wherein the support portion of the image line position adjusting means is disposed in the vicinity of the projection lens of the optical unit casing.   2. The rear projector according to claim 1, wherein the adjuster member is an adjuster block that is disposed at a rear end portion of the bottom surface of the optical unit casing and moves forward and backward by a rotation operation of an adjusting screw.   The rear projector according to claim 1, wherein the optical unit housing includes a cushion member that biases toward the adjuster member.   The image line position adjusting means is adjusted to a predetermined image line position by selectively aligning stepwise different gauge surfaces provided on the outer casing with a reference surface. The rear projector according to 1.

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