JP4622332B2 - Rear projector - Google Patents

Description

  The present invention relates to a rear projector that displays an image on a transmissive screen. Specifically, the lamp optical axis of a light source is made to coincide with the vertical image line position adjustment projected on the screen so This enables a rear projector with high positional accuracy that does not occur.

  In a rear projector with a transmissive screen, the displacement of the optical axis between the lamp optical axis of the light source and the liquid crystal panel constituting the optical unit is important because it causes a decrease in illuminance and color unevenness of the projected image. .

  Conventionally, as described above, as a conventional method for aligning the optical axis of the lamp of the light source with the optical axis of the liquid crystal panel of the optical unit, the optical unit is fixed to the housing of the rear projector. Is fixed to the housing. However, in such a configuration, when the optical unit is made into an actuator, the optical axis shifts from the optical unit when the light source lamp is fixed to the housing. For example, a technique for adjusting the optical axes of the optical unit and the light source lamp has been proposed. (For example, refer to Patent Document 1).

  Here, as a method of aligning the optical axis of the light source lamp when the optical unit is made into an actuator, if the light source lamp is directly attached to the housing of the optical unit, the deviation of the optical axis can be suppressed. There is a problem that it is difficult to fix the light source lamp to the optical unit when there is a restriction due to the high temperature of the lamp accompanying the increase in the lamp brightness or the compactness of the optical unit.

  The present invention has been made to solve the above-described problems. The optical axis of the optical unit projected onto the screen is adjusted so that the lamp optical axis of the light source coincides with the light beam, and the light axis is aligned. An object of the present invention is to obtain a rear projector in which no axis deviation occurs.

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 casing and the projection lens are integrated and can be rotated in the vertical direction with the support portion as a fulcrum, and the optical unit casing and the projection lens have a slope disposed on the bottom surface of the optical unit casing. The vertical image line position projected onto the screen by the forward / backward movement operation of the adjuster member can be adjusted, and the lamp housing of the light source is supported by the optical unit housing via the spring member. The back surface is held by a holding spring member provided in the lamp cover, and the lamp housing follows the image line position adjusting operation of the optical unit housing and the projection lens, and the lamp optical axis is changed to the optical axis of the optical device. It is made to match.

  In the rear projector according to the first aspect, the holding spring member is a double spring in which a leaf spring is further formed on the leaf spring portion.

  According to the rear projector of the first aspect of the present invention, the restraining spring member follows the image position adjustment operation of the optical unit casing and the projection lens so that the lamp optical axis coincides with the optical axis of the optical device. As a result, the optical axis of the light source lamp can be set to an appropriate position without being affected by the high temperature of the lamp accompanying the increase in the brightness of the light source lamp or the restrictions due to the compactness of the optical unit.

  In the rear projector according to claim 2 of the present invention, since the holding spring member is composed of a double spring in which a leaf spring is further formed on the leaf spring portion, the image line positions of the optical unit casing and the projection lens are determined. The restraining spring member holding the light source lamp with respect to the adjusting operation can follow the agility, and the light source lamp can be brought into an appropriate position with respect to a slight movement of the optical unit casing.

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 4 that modulates the light beam emitted from the light source lamp 3 and forms an optical image according to image information, and a projection lens 5 that magnifies and projects the optical image from the optical unit 4 are provided in the lower part of the cabinet 1. Is arranged. The optical image enlarged and projected from the projection lens 5 is reflected by the reflection mirror 6 disposed obliquely in the cabinet 1 and projected onto the screen 7 on the front surface of the cabinet 1.

  FIG. 2 is an enlarged side view of the light source lamp 3, the optical unit 4, and the projection lens 5. The optical unit 4 and the projection lens 5 are integrally formed as a unit, but the optical unit 4 and the projection lens 5 are partitioned by a partition wall 1 a of the cabinet 1. The optical unit 4 is disposed in the partition wall 1a, whereas the projection lens 5 is disposed outside the partition wall 1a, that is, at a position diagonally facing the reflection mirror 6. The optical unit 4 and the projection lens 5 are supported on a partition wall 1a by a supporting boss 8 described later.

  It is the figure which looked at the partition wall 1a in FIG. 3 from the inner side. Supporting bosses 8 and 8 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 9 and 9 are also provided below the supporting bosses 8 and 8, respectively. The optical unit 4 is fixed to the supporting bosses 8 and 8 with screws 10 and 10 (see FIG. 2). The positioning bosses 9, 9 are for engaging a groove (not shown) of the optical unit 4 to position the optical unit 4 at a predetermined position.

  With this configuration, the optical unit 4 and the projection lens 5 can be swung up and down with respect to the cabinet 1 as indicated by white arrows with the supporting bosses 8 and 8 as fulcrums. That is, the projection lens 5 can be moved up and down in the direction of the image line position.

  In the image line position adjusting mechanism, the adjuster block 11 is a member for adjusting the image line position. The adjuster block 11 is located on the bottom cabinet 2 and is arranged so that a convex portion 4 a protruding from the rear end portion of the optical unit 4 is placed on a slope-like slope 12 provided on the upper surface of the adjuster block 11.

  As shown in FIG. 4, the adjuster block 11 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 11 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 11, 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 11 moves forward and backward, whereby the optical unit 4 moves the supporting boss 8. The partition wall 1a around the fulcrum is bent, and the size of the optical unit 4 tilting forward can be varied to adjust the image line position of the projection lens 5. That is, when the adjuster block 11 is entered, the projection lens 5 moves in the direction indicated by the optical axis a in FIG. 1, so that the projected image can be raised, and the adjuster block 11 is moved backward to project the projection lens. 5 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 11 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”.

The structure of the light source lamp, which is the main part of the present invention, will be described with reference to FIGS.
6 is a side view of the light source lamp 3 attached to the housing of the optical unit 4, FIG. 7 is a perspective view of the light source lamp 3 removed from the housing of the optical unit 4, and FIG. FIG. 9 is a perspective view of the lamp cover and the holding spring, with each member of the lamp cover to be held being separated.

  The light source lamp 3 accommodates a lamp (not shown) inside the casing, and the light source lamp 3 is supported by the opening 21 formed in the casing of the optical unit 4 described above. Specifically, the light source lamp 3 is inserted by a pair of upper and lower support springs 22, 22 provided in the opening 21, and the light beam emitted from the light source lamp 3 is reflected by a mirror (not shown) and is incident on the optical unit 4.

  The light source lamp 3 is covered with a lamp cover 23 supported by the cabinet 1 from behind, and the lamp cover 23 is fixed in a cannula shape by a lamp bar 24 fixed to the cabinet 1 from the outside by screws 24.

  Here, on the inner surface side of the lamp cover 23, a leaf spring-like restraining leaf spring 26 that springs the light source lamp 3 toward the opening 21 is attached. As shown in FIG. 9, the restraining plate spring 26 is a first spring in which both sides are fixed portions 27, 27, and the portions bent from the fixing portions 27, 27 in a crank shape are formed in a “<” shape. The portions 28 and 28 and the second spring portions 29 and 29 that are cut out at the central portions of the first spring portions 28 and 28 are also formed in the shape of a “<”.

  The fixing plate springs 26 formed in this way are fixed to the boss portions 23 a and 23 a of the lamp cover 23 by screws 30 and 30.

  That is, the light source lamp 3 is pressed by the first spring portions 28 and 28 of the holding leaf spring 26 supported by the lamp cover 23 and the second spring portions 29 and 29 on the back surface of the light source lamp 3. The casing is spring-held.

  Since the light source lamp 3 is configured as described above, the projection lens 5 is adjusted together with the optical unit 4 by rotating the adjustment screw 17 so that the image line position is adjusted, and the housing of the optical unit 4 is rotated up and down. In accordance with the operation, the light source lamp 3 also moves up and down together with the housing of the optical unit 4 while being supported by the support springs 22 and 22. That is, since the back surface of the light source lamp 3 is pressed by the restraining plate spring 26, the light source lamp 3 follows the operation of moving in the vertical direction, and the restraining plate spring 26 is bent and deformed to change the lamp posture to an appropriate position. Hold on. That is, the light source lamp 3 can always be positioned on the optical axis in accordance with the image line position adjustment of the optical unit 4 without being shifted from the optical axis of the optical unit 4.

  Further, since the restraining plate spring 26 is a so-called double spring in which the second spring portions 29 and 29 are applied to the first spring portions 28 and 28, it is flexibly deformed by the movement operation of the light source lamp 3. Thus, even a slight movement of the light source lamp 3 can be accurately handled.

  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 by this invention. It is a perspective view of the gauge surface structure of image line adjustment. It is a side view of the relationship between an optical unit and a light source lamp. It is the perspective view which isolate | separated the light source lamp from the optical unit. It is the perspective view which the lamp cover holding a light source lamp isolate | separated. It is a perspective view of a lamp cover and a restraining leaf | plate spring.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cabinet, 1a ... Partition wall, 3 ... Light source lamp, 4 ... Optical unit, 5 ... Projection lens, 6 ... Reflection mirror, 7 ... Screen, 8 ... Supporting boss, 11 ... Adjuster block, 12 ... Slope, 22 ... Support spring, 23 ... lamp cover, 25 ... lamp bar, 26 ... holding plate spring, 28 ... first spring portion, 29 second spring portion

Claims (2)

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 for housing the optical unit housing and the projection lens, and a screen for projecting an optical image formed by the image forming unit,
The optical unit casing and the projection lens are integrated and can be rotated in the vertical direction about the support portion, and the optical unit casing and the projection lens are mounted on the bottom surface of the optical unit casing. The vertical image line position projected on the screen can be adjusted by the forward / backward movement operation of the adjuster member having the arranged slope,
A lamp housing of the light source is supported on the optical unit housing via a spring member, and the lamp housing is held by a holding spring member provided on the back of the lamp housing,
In the lamp housing, the holding spring member follows the image line position adjusting operation of the optical unit housing and the projection lens, and the lamp optical axis is made to coincide with the optical axis of the optical device. A featured rear projector.   The rear projector according to claim 1, wherein the holding spring member is a double spring in which a leaf spring is further formed in a leaf spring portion.

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