JP2013134405A - Angular adjustment function and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for suitably maintaining an insertion state of an adjustment screw in a mechanism for adjusting an angle of a mirror for a projector.SOLUTION: An angular adjustment mechanism 100 includes: a mirror 1; a mirror holder 2; a resin housing 3 for attaching the mirror holder 2; a spring 4, a stopper 5 and a plurality of adjustment screws 6. The adjustment screws 6 have a self-tap type screw structures and are inserted to subsidiary apertures 9 of the housing 3 while threading. The positions of the subsidiary apertures 9 are set to abut to prescribed positions on a back surface of the mirror holder 2. So-called straight sections 12 without threads are provided on tips of the adjustment screws 6. Configurations 13 of the straight sections 12 are designed to be sizes capable of being inserted without backlash into inside diameters 10 of the subsidiary apertures 9 of the housing 3.

Description

  The present invention relates to an angle adjustment function and a projector.

  In general, in a projector, an illumination system using a light tunnel is used in order to make light from a lamp enter a display element efficiently and uniformly. Further, in order to increase the light use efficiency, the illumination light irradiation range on the display element is designed to be as small as possible. For this reason, in general, in order to accurately guide light to the display element, some kind of illumination light adjustment mechanism is required.

  One of the adjustment methods is a method of adjusting the angle of the reflecting mirror. For example, the image projection apparatus disclosed in Patent Document 1 includes a plane mirror that refracts an optical path of light from a light source, a mirror holder that holds the plane mirror, and a casting to which the mirror holder is attached. In this image projection apparatus, an instruction portion having an insertion piece at the tip is provided on the non-holding surface of the mirror holder, and a main opening through which the insertion piece is inserted, and an anti-insertion direction of the inserted insertion piece The casting is provided with a repelling piece that pushes up the insertion piece in the insertion direction in accordance with the displacement of the casting. An adjustment column for adjusting the interval between the non-holding surface and the casting is provided by pushing up the non-holding surface of the mirror holder through the sub-opening included in the casting.

  As a particularly inexpensive example using such an angle adjustment method, the housing is made of resin, and the adjustment screw is used for an adjustment screw provided in the housing by using a self-tapping screw such as S-tight (registered trademark). A method of omitting the threading of the holes has been put into practical use. In this method, by setting the diameter of the opening for the adjustment screw of the housing appropriately, it is possible to keep the screw holding torque large and to eliminate the screw loosening prevention processing such as screw lock. is there.

JP 2008-292888 A

  By the way, in the technique disclosed in Patent Document 1, it is necessary to employ a soft and sticky material such as a resin as the material of the housing. Since metal aluminum die-casting is too rigid, once a screw groove is formed by screw insertion, it will rotate with a light torque from the second time onward. Is required. However, when a resin material is used for the housing, since the material is soft, there is a problem that the adjusting screw can be inserted even at an inclined angle with respect to the surface of the screw hole.

  FIG. 8A shows a state where the adjustment screw 106 is correctly inserted, and FIG. 8B shows an insertion state when the adjustment screw 106 is hit diagonally. When the adjusting screw 106 is struck diagonally, the material is destroyed due to excessive deformation on one side of the prepared hole of the screw, and the screw is shallow on the opposite side. For this reason, when the adjusting screw 106 is rotated repeatedly, the thread groove becomes loose, and a problem that the holding torque of the adjusting screw 106 cannot be maintained may occur. If the holding torque of the adjusting screw 106 is reduced, the adjusting screw 106 is loosened due to vibration or the like, resulting in a problem that the mirror angle is shifted.

  In the technique of the patent document, a technique in which the tip is made spherical with respect to the structure of the adjustment column (adjustment screw) for adjusting the angle of the mirror is disclosed, but as described above, the problem regarding the insertion state of the adjustment screw There was no disclosure and technology for countermeasures was required.

  This invention is made | formed in view of the above situations, Comprising: It aims at providing the technique which solves the said subject.

The present invention is an angle adjustment mechanism including a plurality of self-tapping adjustment screws and a resin housing into which the adjustment screws are screwed, and the adjustment screw includes a straight portion at a tip portion of the adjustment screw. And screwed into an opening formed in the housing.
Moreover, the structure fixed to the housing instead of the said adjustment screw may be sufficient as one of the said some adjustment screw.
The projector of the present invention includes the angle adjustment mechanism described above.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can maintain the insertion state of an adjustment screw appropriately can be provided.

It is a figure which shows the angle adjustment mechanism of a reflective mirror based on embodiment. It is a figure which shows the adjustment screw of the angle adjustment mechanism based on embodiment. It is a figure which shows the housing of the angle adjustment mechanism based on embodiment. It is a figure which shows the adjustment screw and housing which concern on embodiment. It is a figure which shows the angle adjustment mechanism based on the modification of embodiment. It is a block diagram of the optical engine of the projector based on Embodiment. It is a perspective view of the optical engine of the projector based on Embodiment. It is a figure which shows the adjustment screw and housing based on a prior art.

  Next, modes for carrying out the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings.

In this embodiment, a mirror adjustment mechanism using a resin housing and a self-tapping adjustment screw is employed.
Furthermore, it has the following feature (1) or (2).
(1) A straight part is provided at the tip of the adjustment screw. The outer diameter of the straight portion is set to an outer diameter that can be inserted without play in the inner diameter of the sub-opening for the adjusting screw provided in the housing. The angle of the mirror can be adjusted using three adjustment screws.
(2) In the adjustment mechanism of (1), one of the three adjustment screws is a fixed structure.
This will be specifically described below.

  FIG. 6 is an example of a configuration diagram illustrating the optical engine 60 of the projector 50 in a plan view. FIG. 7 is an external perspective view of the optical engine 60, and a region indicated by a circle 26 in the drawing is a portion provided with a characteristic configuration (an angle adjusting mechanism 100 described later) in the present embodiment.

  First, the configuration of a general projector 50 will be described according to the light travel path. The light emitted from the lamp 15 a is reflected and collected by the reflector 15 b and enters the color wheel 16. The color wheel 16 is formed in a wheel shape by arranging filters in a predetermined wavelength region such as R, G, and B in the circumferential direction. The light that has passed through the color wheel 16 is transmitted only in a predetermined wavelength range.

  The light that has passed through the color wheel 16 enters the light tunnel 17. The light tunnel 17 is a cylindrical part whose cross section is substantially similar to the display element 24, and the inner surface is a mirror surface. The light reflected a plurality of times on the inner surface of the light tunnel 17 becomes uniform and is emitted. The light emitted from the light tunnel 17 enters the TIR prism 23 through the plurality of lenses 18, 20, 22 and the reflecting mirrors 19, 21.

  The TIR prism 23 is a component in which two prisms are bonded together, and a minute gap (air layer) is provided on the bonded surface. The incident illumination light is totally reflected by the bonding surface and enters the display element 24.

  The light reflected by the display element 24 is designed to be totally transmitted in the direction of the projection lens 25. The light modulated into a predetermined image by the display element 24 passes through the TIR prism 23 and is imaged on the screen by the projection lens 25.

  In such a projector 50, at least one of the reflecting mirrors 19 and 21 is provided with an angle adjusting mechanism 100 as an adjusting mechanism for accurately irradiating the display element 24 with the light from the lamp 15a.

  Next, the angle adjustment mechanism 100 will be described in detail with reference to FIGS. As shown in the plan view of FIG. 1A and the cross-sectional view of FIG. 1B, the angle adjustment mechanism 100 is made of a mirror 1, a mirror holder 2 for holding the mirror 1, and a resin for attaching the mirror holder 2. A housing 3, a spring 4 that generates a load in a direction in which the mirror holder 2 approaches the housing 3, a stopper 5 that fixes the spring 4, and a plurality of adjustment screws 6 are provided.

  A support column 7 is provided at substantially the center of the mirror holder 2. As shown in the plan view of FIG. 3A and the cross-sectional view of FIG. 3B, the housing 3 is provided with a main opening 8 into which the support 7 of the mirror holder 2 is inserted. The main opening 8 is designed to be slightly larger than the outer diameter of the column 7, and the mirror holder 2 is designed so that it can move freely with a backlash relative to the housing 3.

  The housing 3 is provided with a plurality of sub-openings 9. The inner diameter 10 of the sub-opening 9 is designed to be slightly smaller than the outer diameter 11 of the threaded portion of the adjusting screw 6.

  As the material of the housing 3, a PC (polycarbonate) material having excellent heat resistance and impact resistance is suitable. A PC-ABS alloy that is highly moldable and inexpensive by mixing PC-GF and ABS resin, in which glass fiber is mixed with PC to improve heat resistance, is also suitable. Examples of PC materials include MN-3600H from Teijin Ltd., 876-20 from Sumitomo Dow Co., Ltd., and examples of PC-GF include LEXAN 3412ECR from SABIC, GN-3630H from Teijin Ltd. Is given. Examples of PC-ABS alloys include JH-960H from KINGFA, TN-7500 from Teijin Limited, and the like.

  As shown in the plan view of FIG. 2A and the cross-sectional view of FIG. 2B, the adjustment screw 6 has a self-tap screw structure and is inserted into the sub-opening 9 of the housing 3 while cutting the screw. The The position of the sub-opening 9 is set so as to hit a predetermined position on the back surface of the mirror holder 2. As a result, the adjusting screw 6 is stopped at a necessary position, and thereby the mirror 1 can be adjusted to a predetermined angle. By appropriately designing the size of the sub-opening 9, an appropriate holding torque acts on the adjustment screw 6, and it can be prevented from moving due to vibration or the like without being subjected to a locking prevention process.

  Here, a so-called straight portion 12 that is not threaded is provided at the tip of the adjustment screw 6. The outer diameter 13 of the straight portion 12 is designed to be a size that can be inserted into the inner diameter 10 of the sub-opening hole 9 of the housing 3 without backlash.

  As a general material of the adjusting screw 6 that is a self-tapping screw, a carbon steel wire for cold heading (SWRCH) is used. As an example, SWRCH18A is suitable.

  As an example of the design of the adjusting screw 6, for example, when an M3 type screw is used, the outer diameter 11 of the screw threaded portion is about 3 mm. On the other hand, the inner diameter 10 of the sub-opening 9 of the housing 3 is preferably about 2.6 mm. The outer diameter 13 of the straight portion 12 of the adjusting screw 6 is preferably about 2.4 mm as a size that can be inserted into the inner diameter 10 of the sub-opening hole 9 of the housing 3 without backlash.

  According to the angle adjusting mechanism 100 adopting the above configuration, as shown in FIG. 4, since the straight portion 12 is first inserted into the sub-opening 9 of the housing 3 without being inclined, it is possible to avoid slanting of the screw. .

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to combinations of the respective components and the like, and such modifications are within the scope of the present invention. For example, the angle adjustment function 100 may be used for installing the display element 24.

  FIG. 5 shows an angle adjustment mechanism 200 according to a modification. In the angle adjustment mechanism 200, one of the three adjustment screws 6 arranged on the right side in the figure is changed to a fixed structure 14.

  In this modification, the number of adjustment screws 6 can be reduced, and the part cost and adjustment work can be reduced.

DESCRIPTION OF SYMBOLS 1 Mirror 2 Mirror holder 3 Housing 4 Spring 5 Stopper 6 Adjustment screw 7 Post 8 Main opening 9 Sub opening 10 Inner diameter 11, 13 Outer diameter 12 Straight part 14 Structure 15a Lamp 15b Reflector 16 Color wheel 17 Light tunnel 18, 20 , 22 Lenses 19 and 21 Reflector 23 TIR prism 24 Display element 25 Projection lens 50 Projector 60 Optical engine 100 and 200 Angle adjustment mechanism

Claims (3)

An angle adjustment mechanism comprising a plurality of self-tapping adjustment screws and a resin housing into which the adjustment screws are screwed.
The angle adjusting mechanism, wherein the adjusting screw includes a straight portion at a tip portion of the adjusting screw and is screwed into an opening formed in the housing.   The angle adjusting mechanism according to claim 1, wherein one of the plurality of adjusting screws has a structure fixed to a housing instead of the adjusting screw.   A projector comprising the angle adjusting mechanism according to claim 1.

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