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Projector

A projector and drive mechanism technology, applied in the field of projectors, can solve the problems of increased space occupied by the shading body and unstable shading amount, etc.

Active Publication Date: 2012-07-25
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, as in Patent Documents 1 and 2, for example, when a plate-shaped light shielding member (light shielding plate) is opened and closed to shield light, the amount of light shielded may not change smoothly.
In addition, for example, as in Patent Document 3, when a block-shaped light-shielding body with a notch-shaped concave portion is used as a light-shielding member, in order to make the variation of the light-shielding amount meet the needs, a complex curved surface must be formed on the light-shielding body, and the space occupied by the light-shielding body may increase

Method used

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no. 1 Embodiment approach

[0042] Below, refer to figure 1 etc., the projector according to the first embodiment of the present invention will be described.

[0043]

[0044] Such as figure 1 As shown, the projector 100 of this embodiment includes an illumination device 10 , a color separation and light guiding optical system 40 , a light modulation unit 50 , a cross dichroic prism 60 , and a projection (projection) optical system 70 . Among them, the illuminating device 10 is an illuminating optical system including a light source lamp unit 20 , a homogenizing optical system 30 , and a dimming device 80 .

[0045] The optical unit constituting the projector 100, that is, the illuminating device 10, the color separation light guide optical system 40, the light modulator 50, the cross dichroic prism 60, and the projection optical system 70 are generally housed in a light guide device having light-shielding properties. Housing part 11. In addition, these optical units or their constituent elements ar...

no. 2 Embodiment approach

[0085] Below, refer to the attached Figure 8 , the projector according to the second embodiment of the present invention will be described. The projector of this embodiment is figure 1 The modified example of the projector 100 shown has the same structure except for the shapes of the first and second light shielding members 191a, 191b in the first and second light shielding parts 182a, 182b, so only the shapes of the first and second light shielding members 191a, 191b are shown in the figure. Figure 4 For the corresponding parts, the description and illustration of the overall structure of the dimming device and the projector are omitted.

[0086] Figure 8In the first and second light shielding parts 182a and 182b, the first and second light shielding members 191a and 191b are in the shape of stairs or steps (step shape). That is, the recessed portions 192a, 192b of the light shielding members 191a, 191b have a hollow prism shape extending in the Y direction and convex t...

no. 3 Embodiment approach

[0088] Below, refer to the attached Figure 9 , a projector according to a third embodiment of the present invention will be described. The projector of this embodiment is figure 1 A modified example of the projector 100 is shown, so similar to the second embodiment, Figure 9 only means with Figure 4 For corresponding parts, description and illustration of structures other than these parts are omitted.

[0089] Figure 9 In the first and second light-shielding parts 282a, 282b, the concave parts 292a, 292b of the first and second light-shielding members 291a, 291b are made by deep drawing (drawing). Figure 4 The light shielding members 91a, 91b are shown differently. The recessed portions 292a and 292b are formed by performing press working including deep drawing on the portion serving as the distal end portion EG in the manufacturing process of the opening and closing members 298a and 298b, without performing bending. By this deep-drawing process, the concave portion...

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PUM

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Abstract

A projector can realize a relatively stable variation of shading amount and fully reduce the lighting amout in the maximal shielding state by a simple and space-saving construction. A retracted part (92a, 92b) has a effect of notch, acts by the mode that the larger angle of a shading part (91a, 91b) rotates, the larger the notch becomes. Thereby, compared with common shields, the shading part (91a, 91b) can reduce the shading amount along with the increasing of the rotation angle. In addition, the notch effect of the retracted part (92a, 92b) is reduced gradually along with the decreasing of the rotation angle. Thereby, The shading part (91a, 91b) can achieve same shading effect of common shield.

Description

technical field [0001] The present invention relates to a projector having a light-shielding portion for adjusting the amount of light shielding in an illumination optical system. Background technique [0002] As a projector using a shade member for adjusting the lighting device, for example, a projector is known in which a pair of shade members that can be opened and closed by rotation sandwich the illumination light between a pair of lens arrays in the lighting device. They are arranged axially symmetrically, and the amount of blocking of illumination light is adjusted (for example, refer to Patent Documents 1 and 2). In addition, a technique is known in which a block-shaped shade is used as such a shade, and recesses such as notches are provided on the shade to adjust changes in the amount of light shielded (see Patent Document 3). [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2007-71913 [0004] Patent Document 2: Japanese Patent Laid-Open No. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/20G03B21/14G03B21/00G02B27/18
CPCH04N9/3152G02B27/145G02B27/149H04N9/3197G02B5/003G02B27/1046G02B27/0988G03B21/14G03B21/2053
Inventor 望月祐孝吉田宽治
Owner SEIKO EPSON CORP