JP2006003446A - 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 a projected 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, 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 and the projection lens 4 are integrated, and 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, and an adjuster block 10 having an inclined surface 11 is arranged on the base of the optical unit 3, and also the adjuster block 10 is equipped with a presser bar spring 12 pressing and holding the optical unit 3 so as not to cause backlash between the optical unit 3 and the adjuster block 10. The adjuster block 10 adjusts the optical unit 3 and the projection lens 4 in the up-and-down direction of the projected image line with the boss for support 7 as a fulcrum by the rotating operation of an adjusting screw 17. <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, by providing a degree of freedom in adjusting the position of an image line in the vertical direction projected for each set of rear projectors, high-precision image line adjustment is performed. It is possible.

  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 to solve the above-described problems, and provides a degree of freedom in adjusting the vertical image line position projected separately for each set of rear projectors, and has a simple configuration and high accuracy. An object of the present invention is to obtain a rear projector capable of adjusting the position of the image line and eliminating 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 the optical image by the 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 image formation A rear projector including a screen for projecting an optical image formed by the unit,
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 bottom surface of the optical unit housing is inclined. An adjuster member having a surface is disposed, and the adjuster member is provided with a holding spring that is clamped between the adjuster member and the optical unit housing. The body and the projection lens are adjusted in the vertical direction of the projected 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.

  The rear projector according to claim 3 is adjusted to a predetermined image line position by selectively aligning a stair-like gauge surface provided in the outer casing with the reference surface in the image line position adjusting means. Is.

  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 without moving the optical unit housing and the projection lens by simply moving the adjuster member forward and backward. It can be performed.

  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.

  According to the rear projector of the third 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 of 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.

  The image line position adjustment mechanism will be described below. 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 a convex portion 3 a protruding from the rear end portion of the optical unit 3 is placed on a slope-like slope 11 provided on the upper surface of the adjuster block 10.

  Here, one end of a leaf spring-like holding spring 12 having elasticity is fixed to the rear side of the slope 11 of the adjuster block 10. The other end portion 12a which is a free end of the holding spring 12 is engaged with the convex portion 3a of the optical unit 3, and thereby the convex portion 3a is pressed against the inclined surface 11 of the adjuster block 10. That is, the optical unit 3 is pressed against the inclined surface 11 of the adjuster block 10 by the spring biasing force of the holding spring 12 without rattling.

  Further, as shown in FIG. 4, the adjuster block 10 is supported by a support plate 13 disposed on the back side thereof. An adjustment screw support plate 14 adapted to give elasticity is fixed to the outside of the support plate 13 by a fixing screw 16 in a state where one end thereof is held in the holding groove 15. Then, the adjusting screw 17 is screwed into the boss type screw 18 formed in the adjuster block 10 through the adjusting screw support plate 14 and the support plate 13.

  A stepped gauge piece 19 is formed from the end of the adjuster block 10, and the gauge piece 19 is inserted into a groove 20 formed in the support plate 13. This step-like gauge piece 19 has a plurality of gauge surfaces 19a. For example, numbers are displayed on each gauge surface 19a as shown in FIG. 5, and each number is assigned to each number for easy reading. The support plate 13 portion at the corresponding position is also numbered.

  The image line position adjusting mechanism is configured as described above. By rotating the adjusting screw 17 in the clockwise or counterclockwise direction, the adjuster block 10 moves forward and backward, whereby the optical unit 3 moves the support boss 7. The partition wall 1a in the vicinity of the fulcrum is bent, and the size of tilting the optical unit 3 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 19a provided in a stepped shape on the adjuster block 10 serves as a reference as a guideline at which image line position should 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 13 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”.

  In particular, in the present invention, the optical unit 3 is pressed against the inclined surface 11 of the adjuster block 10 by the spring biasing force of the holding spring 12, so that there is no backlash between the optical unit 3 and the adjuster block 10. The optical unit 3 can be moved stably, and the projected image line position can be adjusted with high accuracy.

  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 disassembled state of the image line position adjustment mechanism which has an adjuster block by this invention. 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 ... Retaining spring, 13 ... Support plate, 14 ... adjustment screw support plate, 17 ... adjustment screw, 18 ... boss type screw, 19 ... gauge piece, 19a ... gauge surface

Claims (3)

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 casing and the projection lens are integrated, and the optical unit casing has a support portion that is rotatable in the vertical direction of the image line projected on the screen. An adjuster member having an inclined surface is disposed on the bottom surface of the lens, and the adjuster member is provided with a holding spring that is clamped between the optical unit housing and the adjuster member by rotating the adjusting screw. A rear projector characterized in that the optical unit casing and the projection lens are adjusted in the vertical direction of the projected image line with the support portion as a fulcrum.   The rear projector according to claim 1, wherein the support portion is disposed in the vicinity of the projection lens of the optical unit casing.   2. The image line position adjusting means is adjusted to a predetermined image line position by selectively aligning a stepped gauge surface provided in the outer casing with a reference surface. The rear projector described in 1.

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