JP3299242B2 - projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a projector suitable for use in a color liquid crystal projector or the like.

[0002]

2. Description of the Related Art In recent years, the amount of information processing has been remarkably increased due to the development of information terminals centering on personal computers. With this, there has been a strong demand for a display device capable of expressing its contents more three-dimensionally. Have been.
Generally, as this type of display device, a liquid crystal projector that can easily realize a large screen with a sense of realism is widely known.

Such a projector has a built-in liquid crystal display device in an apparatus housing, has a projection lens at a front (light projection direction) position, and is installed at a position facing a screen. The image display on the screen is performed by forming a display image by a liquid crystal display device and then diffusing and projecting the formed image on the screen by a projection lens. In this case, the projected image on the screen is visually recognized by the observer from the projector installation side of the screen.

Conventionally, this type of liquid crystal projector has been equipped with a lamp reflector having a reflecting surface for reflecting the lamp light, in order to increase the efficiency of using the lamp light emitted from the lamp light source. In such a lamp reflector, the lamp light from the lamp light source is reflected on the reflection surface and used for image formation.

[0005]

However, in a conventional lamp reflector, a visible light (380) emitted from a lamp light source is used by using a cold mirror (diathermy mirror) or the like.
The design is such that only light having a wavelength in the wavelength range of nm to 770 nm) is reflected by the reflecting surface, and light having a specific wavelength (infrared rays or ultraviolet rays) other than visible light is transmitted (reflection is reduced). That is, the lamp light from the lamp light source uses only the visible light component, and the use efficiency of the lamp light is poor. For this reason, there has been a demand for a lamp reflector that can use not only visible light emitted from a lamp light source but also light of a specific wavelength other than visible light.

Japanese Patent Application Laid-Open No. Hei 10-79835 discloses a prior art as an "illumination device", which is described as "disposing a light source near a document reading position, and irradiating ultraviolet light from the light source to the outside. Since a phosphor that converts light into visible light is disposed, "there is a drawback that" only a part of the ultraviolet light reaches the phosphor, and the light conversion rate of ultraviolet light emitted from the light source to visible light is low. "

SUMMARY OF THE INVENTION The present invention has been made to meet such a demand, and converts a light of a specific wavelength into visible light in a reflecting mirror in which an opening of a light source storage space is closed by a filter that blocks light of a specific wavelength. With a very simple structure formed by a reflective member having a light conversion section, light of a specific wavelength other than the visible light emitted from the lamp light source can be used as visible light after light conversion, thereby ensuring lamp light use efficiency. Using a lamp reflector that can be enhanced
The purpose of this is to provide a projector .

[0008]

In order to achieve the above object, a projector according to a first aspect of the present invention has a light source accommodating space that opens in a light projection direction, and a light source accommodating the light source in the light source accommodating space. some reflection Then Tomo visible light
To, have a reflective surface that transmits a specific wavelength light other than the visible light
Reflector and this reflection surface on the side opposite to the lamp light source
Light conversion unit that converts the specific wavelength light into visible light,
The visible light layered on the side of the light
A reflecting film for irradiating the light source housing space of the reflector;
Blocking the specific wavelength light that has closed the opening, and visible light
Using a lamp reflector with a filter that transmits light
There is a configuration. Therefore, the lamp according to the present invention is
The reflector is a reflector, a light conversion unit, a reflection film,
It has a configuration with a filter. Such a configuration
According to the projector, the visible light emitted from the lamp light source is reflected by the reflecting surface of the reflecting mirror, and a specific wavelength light emitted from the lamp light source is radiated to the light conversion unit of the reflecting mirror to be converted into visible light . Reflected by the reflective film
The light source storage space.

[0009]

According to a second aspect of the present invention, the light conversion section is made of a phosphor. Therefore, the visible light emitted from the lamp light source is reflected by the reflecting surface of the reflector, and the specific wavelength light emitted from the lamp light source irradiates the phosphor of the reflector to be converted into visible light.

According to a third aspect of the present invention, the light conversion unit is a light conversion unit that converts light of a specific wavelength other than visible light into red light. Therefore, the visible light emitted from the lamp light source is reflected by the reflecting surface of the reflecting mirror, and the specific wavelength light emitted from the lamp light source irradiates the light converter of the reflecting mirror to be converted into red light.

[0012]

[0013]

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a sectional view showing a configuration example of a projector according to a first embodiment of the present invention, and FIG.
It is sectional drawing of the lamp reflector shown in FIG. 1 and 2, a liquid crystal projector indicated by a symbol P includes a light source 1, a reflector (reflecting mirror) 2, an optical filter 3, a color filter 4, an optical element 5, an image display device 6, a cooling fan 7, and a projection lens 8. Have. The light source 1 is, for example, a lamp light source, and is held in the reflector 3 in the device housing 9. As a result, lamp light is emitted from the light source 1 toward the reflecting surface of the reflector 2 and toward an object (color filter) outside the reflector 2.

The reflector 2 has a light source storage space 2a that opens in the light projection direction, and is stored in the apparatus housing 9 via a mounting portion 10a of a holder 10. The reflector 2 has a reflecting surface 2 b that partially reflects the visible light from the light source 1.
And is formed of a bowl-shaped cold mirror that transmits light of a specific wavelength (for example, ultraviolet light) other than visible light.
On the side opposite to the light source of the reflector 2, there is provided a light conversion unit 2c made of a phosphor (fluorescent paint) for converting light of a specific wavelength into visible light in a red wavelength region, for example, and a reflection film 2d laminated on the light conversion unit 2c. Have been. Thereby, when the lamp light is emitted from the light source 1, the visible light of the lamp light is reflected on the reflection surface 2b.
Reflected by Further, the specific wavelength light of the lamp light is transmitted through the reflector 2 and is converted into visible light (red light) by the light conversion unit 2c, and the red light is reflected by the reflection film 2d and transmitted through the reflector 2 again. Return to the storage space 2a.

As the fluorescent material, calcium halophosphate, cadmium borate, magnesium tungstate, or the like is used, and by mixing these, light of a wavelength (red light) having a required spectrum is emitted.

The optical filter 3 is formed of a cold filter (transmitting glass) that transmits visible light and blocks light having a specific wavelength other than the visible light.
a is mounted so as to close the opening of the light source storage space 2a. Thereby, the specific wavelength light other than the visible light of the lamp light emitted from the light source 1 is blocked by the filter unit 3a, and only the visible light passes through the filter unit 3a.

The color filter 4 comprises an annular filter having first to third filter portions (not shown) arranged in the circumferential direction, and is disposed in front of the reflector 2 (in the direction of projection of lamp light by the reflector 2). Mounted on a motor shaft (not shown) of a motor (not shown).
Is fixed through. Thus, only the red light of the lamp light from the light source 1 passes through the first filter unit, and only the blue light passes through the second filter unit. Further, only the green light passes through the third filter unit.

The optical element 5 comprises an optical element for optically coupling the color filter 4 and the image display device 6, and has a convex lens 5a and a concave mirror 5b. Convex lens 5
“a” is disposed in front of the color filter 4 and is held in the apparatus housing 9 via a holding body 12. Concave mirror 5
b is disposed in front of the convex lens 5a, and
Mounted inside.

The image display device 6 comprises a light reflection type image display device, and is disposed in front of the cooling fan 7.
Further, it is held in the device housing 9 via a holding body 12. A radiating fin 13 as a radiator is attached to a rear portion of the image display device 6. As a result, heat generated from the image display device 6 is radiated into the device housing 9 via the radiating fins 13.

The cooling fan 7 comprises an axial fan rotated by a motor (not shown), is disposed between the radiating fins 13 and the color filter 4, and is provided in the apparatus housing 9 via a holding body 12. Has been held. Thus, when the cooling fan 7 rotates, an airflow toward the heat radiation fins 13 is formed.

The projection lens 8 is disposed in front of the video display device 6 and is attached to the apparatus housing 9 via a lens barrel 14. Thus, the image from the image display device 6 is transmitted through the projection lens 8 and projected on a screen (not shown).

In the thus configured reflector of the liquid crystal projector, in order to use the lamp light emitted from the light source 1, the visible light from the light source 1 is reflected by the reflecting surface 2b of the reflector 2, and the specific light other than the visible light is reflected. This is performed by converting the wavelength light into visible light by the light conversion unit 2c and reflecting the visible light by the reflection film 2d. That is, when the reflector 2 according to the present embodiment is used, the visible light reflected by the reflecting surface 2b and the visible light converted by the light conversion unit 2c out of the lamp light from the light source 1 toward the reflector 1 are used as the light source for the liquid crystal projector P. Can be used.

In this case, since the liquid crystal projector is a color projector, red (R) and green (G) are used as visible light.
Since only the three primary colors of blue and blue (B) are used (yellow, cyan, magenta, and the like are not used as intermediate colors in the visible wavelength component), wavelength light (for example, red light) exhibiting the lowest characteristic among them is compensated. That is, if the specific wavelength light is converted into red light by the light conversion unit 2c, it is convenient in reproducing white on a screen, and the light emission characteristics as a whole can be improved.

Therefore, in the present embodiment, the visible light emitted from the light source 1 is reflected by the reflecting surface 2b of the reflector 2, and the light having a specific wavelength other than the visible light emitted from the light source 1 is applied to the light conversion section 2c of the reflector 2. As a result, the component of the lamp light emitted from the light source 1 can be used over a wide wavelength range.

The image display (color image display) by the liquid crystal projector P in this embodiment is performed as follows. First, the lamp light emitted from the light source 1 passes through the optical filter 3 and goes to the color filter 4. At this time, some visible light emitted from the light source 1 is
, But other visible light is transmitted through the optical filter 3 after being reflected by the reflection surface 2 b of the reflector 2. Also,
Light having a specific wavelength other than the visible light emitted from the light source 1 passes through the reflector 2 and is converted into visible light by the light conversion unit 2c. The visible light is reflected by the reflection film 2d and returns to the light source storage space 2a. 3 is transmitted.

Next, the transmitted light passes through the color filter 4, and the transmitted light irradiates the image display device 6 via the convex lens 5a and the concave mirror 5b. At this time, when the color filter 6 rotates and the red light passes through the first filter unit, a red image is formed on the video display device 6. When the blue light and the green light pass through the second filter unit and the third filter unit, respectively, a blue image and a green image are formed on the video display device 6, respectively.

Then, the image from the image display device 6 is enlarged and projected on the screen via the projection lens 8.
In this way, a color image is displayed on the screen.

Further, in the present embodiment, the case where ultraviolet light as specific wavelength light is converted into red light as visible light has been described. However, the present invention is not limited to this, and other specific wavelength light (for example, infrared light) may be used. ) To other visible light (eg green,
Blue).

In addition, in the present embodiment, the case where the shape of the reflector 2 is bowl-shaped has been described. However, the present invention is not limited to this. For example, a conical reflector may be used, and the shape is appropriately changed. be able to. Also,
In the present embodiment, a case where the present invention is applied to a color projector has been described, but the present invention is not limited to this.
The present invention can be applied to a monochrome projector similarly to the embodiment.

[0031]

As described above, according to the present invention, the light
The component of the lamp light emitted from the source over a wide wavelength range
Can be used, ensuring efficient use of lamp light
Can be increased. Also, the light is converted in the light conversion unit.
By selecting the appropriate visible light, the light emitted from the light source
It can compensate for wavelength light that shows low characteristics among long light.
As a result, the overall light emission characteristics can be improved.
You.

[0032]

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a projector according to a first embodiment of the invention.
It is sectional drawing which shows an example.

FIG. 2 is a sectional view showing the lamp reflector shown in FIG . 1;
You.

[Explanation of symbols]

 Reference Signs List 1 light source 2 reflector 2a light source storage space 2b reflection surface 2c light conversion unit 2d reflection film 3 optical filter 3a filter unit 4 color filter 5 optical element 6 video display device 7 cooling fan 8 projection lens P liquid crystal projector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI G09F 9/00 360 H04N 5/74 A H04N 5/74 K 9/31 C 9/31 G02F 1/1335 530 (58) Field (Int.Cl. ⁷ , DB name) G03B 21/14 F21V 7/22 G02F 1/13 505 G02F 1/13357 G09F 9/00 360 H04N 5/74 H04N 9/31

Claims (3)

(57) [Claims] 1. A light source storage space having an opening in a light projection direction is provided.
The visible light from the lamp light source in this light source storage space
Some reflectionAlong withSpecific wavelength light other than this visible light
Reflection throughA reflector having a surface; The specific wavelength formed on the reflection surface on the side opposite to the lamp light source.
A light conversion unit that converts light into visible light, Visible light laminated on the side of the light
A reflective film that reflects, Close the opening of the light source storage space of the reflector.
In addition, a filter that blocks the specific wavelength light and transmits visible light.
With a filter Characterized by using a lamp reflector
Projector. 2. The projector according to claim 1 , wherein the light conversion unit is made of a phosphor. Wherein the light converting portion, characterized in that said specific wavelength light is light converting unit which converts the red light Claim 1
Or the projector according to 2 .