JP6929134B2 - Projection type display device - Google Patents

Description

The present invention relates to a projection type display device whose specifications can be changed by inserting an optical element.

In recent years, the applications of projection display devices have expanded to various fields such as presentations, projection mapping, flight simulators, and 3D image projection. Along with this, there are a wide variety of specifications required for each field such as enlargement of the color gamut of the projected image, improvement of contrast, and 3D image projection.

In order to meet such demands, in addition to the conventional optical configuration, it has been proposed to arrange a special optical element inside the projection type display device or to replace a specific optical element with a special optical element. .. Further, it has been proposed to arrange a special optical element between the projection type display device and the projection object.

In response to such a proposal, Patent Document 1 discloses a projection type display device that can be easily attached and detached and its position can be adjusted in order to reduce the man-hours for replacing the polarizing plate and the optical compensation plate. Patent Document 2 discloses a configuration in which a shielding means for shielding a light beam emitted from a projection type display device for a predetermined time is arranged on the output side of the projection type display device in order to improve the image quality of moving images.

Japanese Unexamined Patent Publication No. 2008-58674 JP-A-2006-30493

However, in the configuration disclosed in Patent Document 1 or Patent Document 2, the work man-hours may increase by incorporating or replacing a special optical element inside the projection type display device. In addition, since these operations require specialization, it is often difficult to perform replacement work while using the projection type display device. In this case, there is a high possibility that it will be necessary to move the projection type display device to the service base once, perform replacement work by a specialized worker, and return it to the user again. Further, if a special optical element or optical device is arranged on the emission side of the projection type display device, it is necessary to secure a large installation space due to the increase in size of the projection type display device.

Accordingly, the present invention aims to provide a projection display equipment replacement easy compact optical element.

The projection type display device as one aspect of the present invention is a projection type display device to which a lens device can be attached and detached. It has a holding portion provided with an opening through which a light beam emitted from the combining portion passes, and a housing for accommodating the combining portion and to which the holding portion is attached, and an optical element is attached to the holding portion. The mounting portion is provided with a first mounting portion provided on the first surface of the holding portion and a second mounting portion on the side opposite to the first surface of the holding portion. It has a second mounting portion provided on the surface, and the first optical element can be mounted as the optical element on the first mounting portion, and the optical element can be mounted on the second mounting portion. A second optical element can be attached .

The projection type display device as another aspect of the present invention is a projection type display device to which a lens device can be attached and detached, and has a compositing unit that synthesizes a luminous flux modulated by an optical modulation element and an emission surface side of the compositing unit. The holding portion is provided with an opening through which the light flux emitted from the composite portion passes, and a housing for accommodating the composite portion and to which the holding portion is attached. The holding portion is provided with an optical element. A mounting portion that can be mounted is provided, and an air passage for cooling the optical element is formed in the housing.

Other objects and features of the present invention will be described in the following examples.

According to the present invention, it is possible to exchange the optical element to provide a projection display equipment easy small.

It is a side view of the optical unit in each Example. It is a perspective view of the color separation composition block and the projection block in Example 1. FIG. It is a block diagram of the optical component of a normal optical specification in Example 1. FIG. It is sectional drawing along the line WW in FIG. It is a figure seen from the arrow U in FIG. It is a block diagram of the optical component of the special optical specification in Example 1. FIG. It is a perspective view of the frame body in Example 1. FIG. It is a figure seen from the arrow P in FIG. It is a block diagram of the optical component of a normal optical specification in Example 2. FIG. It is a figure seen from the arrow Q in FIG. It is external perspective view of the projection type display device in each Example. It is an internal perspective view of the projection type display device in each Example.

Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

First, the projection type display device according to the first embodiment of the present invention will be described with reference to FIGS. 11 and 12. FIG. 11 is an external perspective view of the projector (projection type display device) 6 in this embodiment. FIG. 12 is an internal perspective view of the projector 6, showing a state in which the cover 60 is removed from the projector 6 shown in FIG. As shown in FIG. 12, the projector 6 has an optical unit (optical engine unit) 5. A projection lens 4 (lens device) for projecting an image is detachably attached to the projector 6.

Next, the configuration of the optical unit 5 will be described with reference to FIG. 1A and 1B are side views of the optical unit, FIG. 1A shows a view seen from the z direction, and FIG. 1B shows a view seen from the x direction. As shown in FIG. 1, the optical unit 5 includes a light source unit (light source unit) 1, an illumination optical block (illumination optical system) 2, a color separation composite block (color separation composite optical system) 3, and a projection block (projection). It has a lens 4).

Next, the normal optical specifications of the projector 6 in this embodiment will be described with reference to FIGS. 2 to 5. FIG. 2 is a perspective view of the color separation composite block 3 and the projection block (projection lens 4). FIG. 3 is a block diagram of optical components of the projector 6 having normal optical specifications. FIG. 4 is a cross-sectional view taken along the line WW in FIG. FIG. 5 is a view seen from the arrow U in FIG. 3, and the projection lens 4 is omitted.

The projection lens (lens device) 4 has a projection optical system 41a and a flange portion 411a as a mounting portion for the projector 6. The color separation synthesis block 3 includes three light modulation elements (liquid crystal panels) 31, 32, 33, a lens shift block 34, a housing (holding member) 35, a prism unit 36, and a dichroic mirror corresponding to each color of red, blue, and green. It has 37 and a frame body (holding portion) 38. The housing 35 houses and holds the light modulation elements 31 to 33, the prism unit 36, the dichroic mirror 37, the frame body 38, and the projection optical system 41a.

The lens shift block 34 has a z-direction shift movable plate 341, an x-direction shift movable plate 342, and a shift base 343. As shown in FIG. 5, the z-direction shift movable plate 341 is connected to the flange portion 411a of the projection optical system 41a. Further, the z-direction shift movable plate 341 has an opening 341a in order to avoid interference with the projection optical system 41a. The x-direction shift movable plate 342 holds the z-direction shift movable plate 341. Further, the x-direction shift movable plate 342 has an opening in order to avoid interference with the projection optical system 41a. The shift base 343 holds the x-direction shift movable plate 342 and is connected to the housing 35. Further, the shift base 343 has an opening in order to avoid interference with the projection optical system 41a. The lens shift block 34 has a shift plate drive unit (not shown), and can move the projection optical system 41a in the z-axis direction and the x-axis direction, respectively.

The white light emitted from the illumination optical block 2 in which the plurality of optical elements including the light source unit 1 are arranged is directed to the dichroic mirror 37. The surface of the dichroic mirror 37 is coated with a film having a property of reflecting light of red wavelength and blue wavelength and transmitting light of green wavelength. The red wavelength and blue wavelength light reflected by the dichroic mirror 37 and the green wavelength light transmitted through the dichroic mirror 37 are incident on the optical modulation elements 31, 32, and 33 corresponding to the respective colors. The light modulated by the respective light modulation elements 31, 32, 33 is synthesized by the synthesis prism (synthesis unit) 361 provided inside the prism unit 36. The luminous flux synthesized by the synthetic prism 36 passes through the opening 385 of the frame body 38 and heads toward a projection object such as a screen via the projection optical system 41a. As described above, the frame body 38 is provided on the exit surface side of the composite prism 361 (between the composite prism 361 and the projection optical system 41a), and has an opening 385 through which the light flux emitted from the composite prism 361 passes.

As shown in FIG. 3, the frame body 38 is fastened to the housing 35 of the color separation synthesis block 3 with screws 386. Further, the frame body 38 can be removed in the same direction as the removal direction of the replaceable projection optical system 41a. That is, the frame body 38 is detachably attached to the housing body 35 by using screws 386. Further, the frame body 38 can be attached to and detached from the housing body 35 with the projection optical system 41a removed from the projector 6.

As shown in FIG. 5, the outer shape of the frame body 38 is smaller than the opening 341a of the z-direction shift movable plate 341. Therefore, the frame body 38 can be removed and incorporated with the projection optical system 41a removed. The frame 38 has an opening 385 through which the effective luminous flux passes. That is, the frame body 38 allows the effective light flux to pass through the opening 385 and blocks other light flux. As shown in FIG. 4, the opening 385 (diameter D1) of the frame body 38 is smaller than the outer size (diameter D2) of the composite prism 361 (D1 <D2). With such a configuration, the frame body 38 can block unnecessary light incident on the projection optical system 41a. That is, it is possible to suppress the projection of unnecessary light outside the screen of the projected image and obtain a high-quality projected image.

Next, the special optical specifications of the projector 6 will be described with reference to FIGS. 6 to 8. The special optical specification means, for example, an optical specification for expanding the color gamut of an image projected on a screen to obtain a more vivid image and at the same time obtaining an image with improved contrast. It is used separately from. FIG. 6 is a block diagram of an optical component having special optical specifications. 7A and 7B are perspective views of the frame body 37, FIG. 7A shows a view viewed from one surface side, and FIG. 7B shows a view viewed from the other surface side. FIG. 8 is a view seen from the arrow P in FIG.

As shown in FIG. 6, in the special optical specification, unlike the normal optical specification described with reference to FIG. 3, a special coating film is formed between the exit surface of the prism unit 36 and the incident surface of the projection optical system 41a. The optical elements (optical filters) 39a and 39b that have been subjected to the above are arranged. As shown in FIG. 7, mounting portions (recesses) 383 and 384 are formed on both sides of the frame body 38, respectively. The optical elements 39a and 39b are attached to both sides of the frame body 38 at the attachment portions 383 and 384, respectively. That is, the frame body 38 has a mounting portion 383 (first mounting portion) provided on the first surface of the frame body 38 as a mounting portion and a second mounting portion on the side opposite to the first surface of the frame body 38. It has a mounting portion 384 (second mounting portion) provided on the surface. An optical element 39a (first optical element) is attached to the attachment portion 383, and an optical element 39b (second optical element) is attached to the attachment portion 384. Further, the frame body 38 is formed with air passages 381 and 382 for guiding cooling air to the optical elements 39a and 39b to cool the optical elements 39a and 39b.

As shown in FIG. 8, an air passage 351 for cooling the optical element attached to the frame body 38 is formed on the side surface of the housing body 35. The air passages 381 and 382 of the frame body 38 are provided corresponding to the positions of the air passages 351. With such a configuration, it is possible to arrange a special optical element that requires arbitrary temperature control. In this embodiment, the frame body 38 is incorporated inside the optical unit 5 regardless of the optical specifications (either the normal optical specifications or the special optical specifications).

The focal length changes by adding the optical elements 39a and 39b between the projection optical system 41a and the three light modulation elements 31, 32 and 33. Therefore, in this embodiment, as shown in FIG. 6, it is preferable to provide an adjusting member 42 for adjusting the focal length between the flange portion 411a of the projection optical system 41a and the lens shift unit 34. More preferably, the adjusting member 42 can adjust an arbitrary focal length. Thereby, the thickness of the added optical element in the optical axis direction and the inclination of the incident surface and the exit surface can be taken into consideration for adjustment. Therefore, according to this embodiment, it is possible to provide a projection type display device that achieves both ease of specification change work and miniaturization.

Next, Example 2 of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 is a block diagram of optical components having normal optical specifications in this embodiment. FIG. 10 is a view seen from the arrow Q in FIG.

In this embodiment, the lens device (projection lens) 40 has a projection optical system (projection block) 41b, a flange portion 411b, and a cylindrical portion (housing) 412b. The frame body (holding portion) 138 is fixed to the incident surface side of the projection lens 40. By using the fastening screw 387 as the fixing member, the frame body 138 is detachably attached to the cylindrical portion 412b of the projection lens 40. In this embodiment, the frame body 138 has an opening 185 through which the light flux emitted from the projector 6 passes. The projection lens 40 projects a luminous flux that has passed through the aperture 185. The frame body 138 is provided with a mounting portion (recessed portion) 183 to which an optical element can be mounted. As shown in FIG. 10, the frame body 138 has a size that does not protrude in the circumferential direction from the outer shape of the cylindrical portion 412b on the incident surface of the projection optical system 41b. As a result, it is possible to avoid interference between the frame body 138 and peripheral parts due to the lens shift operation.

As a result, the frame body 138 needs to be replaced every time the projection lens 40 is replaced due to a change in the projection conditions or the like, but the same effect as in the first embodiment can be obtained. For this reason, with regard to the projection type display device, which can improve the functions of optical specifications such as expanding the color gamut of the projected image and improving the contrast by adding or replacing a predetermined optical element, the specification change work is easy and the size is small. It is possible to make it compatible with the conversion. Further, it is possible to provide a lens device that can be attached to and detached from such a projection type display device.

According to each embodiment, it is possible to exchange the optical element to provide a projection display equipment easy small.

Although preferable examples of the present invention have been described above, the present invention is not limited to these examples, and various modifications and changes can be made within the scope of the gist thereof.

For example, by combining a structure in which an optical path control device that shifts the axis of image light can be attached and detached while blocking unnecessary light other than the effective luminous flux, various modifications and changes can be made within the scope of the gist.

6 Projector (projection type display device)
35 Holding member (housing)
38 Frame (holding part)
361 Synthetic prism (composite part)
383, 384 mounting part

Claims (13)

It is a projection type display device with a removable lens device.
A synthesizer that synthesizes the luminous flux modulated by the light modulation element,
A holding portion provided on the exit surface side of the composite portion and having an opening through which the light flux emitted from the composite portion passes.
It has a housing that houses the composite part and to which the holding part is attached.
The holding portion is provided with a mounting portion to which an optical element can be mounted .
The mounting portion includes a first mounting portion provided on the first surface of the holding portion and a second mounting portion provided on a second surface of the holding portion opposite to the first surface. With a part,
A first optical element can be attached to the first attachment portion as the optical element.
A projection type display device characterized in that a second optical element can be attached to the second attachment portion as the optical element. The holding portion is a projection display device according to claim 1, wherein the benzalkonium been detachably attached to the housing. Wherein the projection display device in a state of detaching the lens device, wherein the holding portion is a projection display device according to claim 2, wherein the detachable der Turkey against the housing. The holding portion is a projection display device according to any one of claims 1 to 3, wherein the holdable der benzalkonium an optical filter as the optical element. Wherein the opening of the holding portion, a projection display device according to any one of claims 1 to 4, characterized in the go smaller than the outer shape of the exit surface of the combining part. The holding portion passes the effective light beam through said aperture, the projection display device according to any one of claims 1 to 5, wherein the benzalkonium to shield the other light beam. Wherein the holding portion and the housing, the projection display device according to any one of claims 1 to 6, wherein the benzalkonium been air path for cooling the forming the optical element. It is a projection type display device with a removable lens device.
A synthesizer that synthesizes the luminous flux modulated by the light modulation element,
A holding portion provided on the exit surface side of the composite portion and having an opening through which the light flux emitted from the composite portion passes.
It has a housing that houses the composite part and to which the holding part is attached.
The holding portion is provided with a mounting portion to which an optical element can be mounted.
A projection-type display device characterized in that an air passage for cooling the optical element is formed in the housing. The projection type display device according to claim 8, wherein the holding portion is detachably attached to the housing. The projection-type display device according to claim 9, wherein the holding portion is removable from the housing in a state where the lens device is removed from the projection-type display device. The projection type display device according to any one of claims 8 to 10, wherein the holding portion can hold an optical filter as the optical element. The projection type display device according to any one of claims 8 to 11, wherein the opening of the holding portion is smaller than the outer shape of the exit surface of the combining portion. The projection type display device according to any one of claims 8 to 12, wherein the holding portion allows an effective light flux to pass through the opening to block other light flux.

Images