JP2002333668A - Projection display device - Google Patents

Abstract

(57) [Problem] In a conventional projection display device, in order to open a lamp cover and remove a lamp box, it is necessary to provide a means for protecting against temperature, such as not touching a high-temperature portion. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the related art, and an object of the present invention is to provide a projection display device that can easily take out a lamp box without a protection means against temperature. SOLUTION: A lock mechanism 8 is rotatably fixed to the light source means, and has a lever 11 as a locking member, a winding spring 12,
It is attached to the lamp cover 6 and comprises a key portion 14 which is a locking portion where the locking member is hooked at a predetermined temperature or higher. When the temperature of the bimetal 7 becomes equal to or lower than the operating point on the low-temperature side, the bimetal 7 becomes the shape B, and the winding spring 12 presses the lever 11 against the bimetal 7 as shown in FIG. Key part 14
Is released, and the lamp cover 6 can be removed from the housing 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device, and more particularly to a lamp cover which opens and closes when a lamp is replaced, and its periphery.

[0002]

2. Description of the Related Art FIG. 12 is a perspective view showing each element of a conventional projection display device, wherein 1 is a lamp, 2 is a lamp box, 4 is a housing, 5 is an opening, and 6 is a lamp cover. .
When the lamp life has expired, the user can easily replace the lamp by removing the lamp cover 6 and replacing the lamp box 3 containing the lamp 1.
In addition, as a projection type display device provided with a lamp cover, for example, there is one described in Japanese Patent Application Laid-Open No. 2000-56396.

[0003]

In the above-mentioned conventional projection type display device, the lamp serving as the light source decreases in illuminance as it is used, and the time when the illuminance becomes 50% of the initial illuminance is generally called the life of the lamp. Therefore, it is necessary to replace the lamp every hundreds to thousands of hours.

During lamp operation, the lamp is mainly used as a heat source, and the temperature of the lamp, the lamp box and the surrounding structures increases. Therefore, in order to open the lamp cover and remove the lamp box, it is necessary to provide a means for protecting against temperature, for example, by not touching a high-temperature portion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide a projection type display device in which a lamp box can be easily taken out without means for protecting against temperature. I do.

[0006]

In the projection type display device according to the present invention, the lock means is attached to the light source means and is attached to a cover which is deformed by temperature, and is attached to the cover. And a locking portion to be hooked.

Further, the deformable member has both ends supported by the light source means, and presses the locking member locked by the bending portion with the locking portion by bending deformation due to temperature change.

Further, the locking member is rotatably fixed to the light source means, is rotated by being pushed by the curved portion, and locks with the locking portion.

Further, the locking member is fixed to the light source means so as to slide by the curved portion, and is locked with the locking portion.

Further, the deformable member has one end supported by the light source means and the other end curved by deformation due to temperature change.
It locks with the locking portion.

Further, the deformable member is a bimetal formed by laminating metals having different coefficients of thermal expansion.

Further, the deformable member is a shape memory alloy which is deformed by temperature.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIGS. 1 and 2 are cross-sectional views showing a peripheral portion of a lamp of a projection type display apparatus according to Embodiment 1 of the present invention. The lamp which emits light to the lamp 2 is the lamp 1
And a lamp box 3 forming an exchangeable light source means, an optical engine 3 for receiving an optical system member for receiving a light beam from the lamp 1 and outputting image light, and a lamp box 4 for supporting the light source means. , Fixed, optical engine 3
5 is an opening in the housing 4 for taking out the lamp box 2 to the outside, and 6 is a lamp cover which covers the opening 5 and opens and closes when the lamp box 2 is taken out.

Reference numeral 7 denotes a bimetal which is attached to the lamp box 2 and operates by detecting its temperature. Reference numeral 8 denotes a switch which uses the bimetal 7 as a switch so that the light source and the cover are locked when the temperature of the light source is higher than a predetermined temperature. In addition, a lock mechanism for restricting removal of the lamp cover 6 is provided.

Further, the lock mechanism 8 is rotatably fixed to the light source means, and is attached to the lever 11, the winding spring 12, and the lamp cover 6, which are locking members, and the locking member is hooked at a predetermined temperature or higher. The key part 14 is a part.

The bimetal 7, which is a deformable member deformed by temperature, is supported at both ends by the light source means, and presses a locking member locked with the locking portion at the bent portion by a bending deformation due to a temperature change. . When the temperature reaches a certain temperature T1 ° C. or higher (hereinafter referred to as a high-temperature side operating point) or more, the shape is deformed to take a curved shape A, and a predetermined temperature T
When the temperature reaches 2 ° C. or lower (hereinafter referred to as a low-temperature side operating point) or lower, the shape is deformed to be a shape B due to a curved deformation. Therefore, the bimetal 7 takes one of the shapes A and B according to the temperature change. Figure 1 shows bimetal 7
Is at a temperature equal to or higher than the high-temperature side operating point, and is thus in the shape A. FIG. 2 shows a state in which the bimetal 7 is at a temperature equal to or lower than the low-temperature side operating point, and is therefore in the shape B.

As the predetermined temperature, a metal of UL standard relating to "parts inside a device which can be contacted": 70.degree.
Glass, porcelain, vitreous: 80 ° C, plastic, rubber: 95 ° C, or JQA standard metal, glass, pottery for “outer shells (things that are not likely to be touched easily)” 100 ° C: Others based on 100 ° C I can decide.

When the temperature of the bimetal 7 becomes equal to or higher than the operating point on the high-temperature side, the bimetal 7 has the shape A, and as shown in FIG. 1, the bimetal 7 pushes the lever 11, and the pushed lever 11 pivots. By hooking the key portion 14 attached to the lamp cover 6, the lamp cover 6 cannot be removed from the housing 4.

When the temperature of the bimetal 7 becomes equal to or lower than the operating point on the low-temperature side, the bimetal 7 assumes a shape B, and as shown in FIG.
, The hook between the lever 11 and the key portion 14 attached to the lamp cover 6 is released, and the lamp cover 6 can be removed from the housing 4.

In the projection type display device thus configured, the lamp 1 is turned on to use the lamp 1 as a heat source for the lamp 1, the lamp box 2, the optical engine 3, the housing 4, and the lamp cover 6. The temperature rises. Accordingly, the temperature of the bimetal 7 attached to the lamp box 2 also increases.

Here, at the operating temperature of the bimetal 7,
By setting the low-temperature operating point to a temperature equal to or higher than the product guarantee temperature upper limit of the projection display device, the high-temperature operating point to be higher than the low-temperature operating point, and equal to or lower than the temperature of the bimetal 7 when the lamp 1 is turned on, as shown in FIG. The projection type display device having the operation shown in the chart can be obtained. In FIG. 3, the horizontal axis represents the passage of time including turning on and off the lamp in the projection display device, and the vertical axis represents the temperature of the lamp box 2 and the temperature of the bimetal 7. A region 100 represents a period during which the lamp cover cannot be removed due to the bimetal 7 having the shape A, and a region 200 represents a period during which the lamp cover can be removed due to the bimetal 7 having the shape B. .

With the above configuration, the lamp cover 4 that can be removed at any time can be removed from the area 100.
Will not be possible. Therefore, it is possible to prohibit the user from touching the lamp box 2 for replacing the lamp in the area 100, so that the lamp box can be easily taken out without any means for protecting against temperature.

Embodiment 2 FIG. FIGS. 4 and 5 are cross-sectional views showing the periphery of the lamp of the projection display device according to Embodiment 2 of the present invention. 4 and 5, the lock mechanism 8 includes a slide lever 20 that is pushed by the curved portion of the bimetal 7 and slides, a spring portion 21, and a key portion 22 attached to the lamp cover 6.

When the temperature of the bimetal 7 becomes higher than the operating point on the high-temperature side, the bimetal 7 has a curved shape A, and has a structure in which the slide lever 20 is inserted into the key portion 22 as shown in FIG. It becomes impossible to remove it from the body 4. When the temperature of the bimetal 7 becomes lower than the operating point on the low-temperature side, the bimetal 7 has a shape B without a curve, and the slide lever 20 has a structure separated from the key portion 22 as shown in FIG. It can be removed. With the above configuration, the same effect as described in the first embodiment can be obtained.

Third Embodiment FIGS. 6 and 7 are cross-sectional views showing a peripheral portion of a lamp of a projection display apparatus according to a third embodiment of the present invention. 6 and 7, the lock mechanism 8 includes the slide lever 3.
0, a spring portion 31 and a hole portion 32 of the lamp cover 6. The lamp cover 6 is opened and closed by sliding along the housing 4.

When the temperature of the bimetal 7 becomes equal to or higher than the operating point on the high temperature side, the bimetal 7 has a curved shape A. As shown in FIG. 6, the structure is such that the slide lever 30 is inserted into the hole 32, and the lamp cover 6 is opened. It becomes impossible. When the temperature of the bimetal 7 becomes lower than the operating point on the low-temperature side, the bimetal 7 has a shape B without a curve, and the slide lever 30 is separated from the hole 32 as shown in FIG. Becomes With the above configuration, the same effect as described in the first embodiment can be obtained.

Embodiment 4 FIGS. 8 and 9 are cross-sectional views showing a peripheral portion of a lamp of a projection type display apparatus according to Embodiment 4 of the present invention. In FIGS. 6 and 7, the lock mechanism 8 has a bimetal 7 that is supported at one end by the lamp box 2 as a light source unit and that is locked at the other end by a bending deformation due to a temperature change.
The key cover 40 is a locking portion attached to the lamp cover 6.

When the temperature of the bimetal 7 becomes higher than the operating point on the high-temperature side, the bimetal 7 has a curved shape A, and the unfixed end of the lamp box 2 is displaced, and the key portion 40 is displaced.
As shown in FIG. 8, the lamp cover 6 cannot be removed from the housing 4. When the temperature of the bimetal 7 becomes lower than the operating point on the low-temperature side, the bimetal 7 has a shape B without a curve, and is in a state as shown in FIG. 9, and the unfixed end of the lamp box 2 of the bimetal 7 is separated from the key portion. The lamp cover 6 can be removed from the housing 4. With the above configuration, the same effect as that described in the first embodiment can be obtained with a smaller number of components.

Embodiment 5 FIGS. 10 and 11 are cross-sectional views showing a peripheral portion of a lamp of a projection type display apparatus according to Embodiment 5 of the present invention. FIG.
0 and FIG. 11 are characterized in that the bimetal 7 is replaced with a shape memory alloy 50 in the structure shown in the first embodiment.

When the shape memory alloy 50 reaches a certain temperature T1 ° C. (hereinafter, referred to as a high-temperature side operating point) or more, the shape is deformed to take a shape C, and a certain temperature T2 ° C.
When the temperature reaches the value below, the shape is deformed to take shape D. Therefore, the shape memory alloy 50 takes one of the shapes C and D according to the temperature change. FIG. 10 shows a state where the shape memory alloy 50 is at a temperature equal to or higher than the high-temperature side operating point, and is therefore in the shape C. FIG. 11 shows a state in which the shape memory alloy 50 is at a temperature equal to or lower than the low-temperature side operating point, and is therefore in the shape D.

Here, at the operating temperature of the shape memory alloy 50, the low-temperature operating point is set to a temperature equal to or higher than the product guarantee temperature upper limit of the projection display device, the high-temperature operating point is set to be larger than the low-temperature operating point,
By setting the temperature to be equal to or lower than the temperature of the shape memory alloy 50 when the lamp 1 is turned on, the same effect as described above in the first embodiment can be obtained. Also, in Embodiments 2 to 4, it is apparent that the same effect can be obtained by replacing the bimetal 7 with the shape memory alloy 50.

In the first to fifth embodiments, the bimetal 7 or the shape memory alloy 50 is attached to the lamp box 2. However, the same effects can be obtained by attaching the bimetal 7 or the shape memory alloy 50 to the lamp cover 6, the optical engine 3, and the housing 4. Is obtained

According to the first to fifth embodiments, in the projection display device according to the present invention, the locking means is attached to the light source means, and the deformable member is deformed by temperature.
The cover is attached to the cover, and has a locking portion where the deformable member is hooked at a predetermined temperature or higher, so that the cover does not come off at a predetermined temperature or higher.

Further, the deformable member is supported at both ends by the light source means, and by a bending deformation caused by a temperature change, the bending member presses a locking member locked with the locking portion by the bending portion, whereby an engagement by the temperature change is caused. Can be stopped.

Further, the locking member is rotatably fixed to the light source means, rotates by being pushed by the curved portion, and locks with the locking portion, so that the movement of the locking member is controlled. Can be bigger.

Further, the locking member is fixed to the light source means so as to slide by the curved portion, so that the locking with the locking portion can be ensured.

Further, the deformable member has one end supported by the light source means, and the other end is locked to the locking portion by a curved deformation due to a temperature change, so that the configuration can be simplified.

Further, since the deformable member is a bimetal formed by laminating metals having different coefficients of thermal expansion, the degree of deformation can be easily changed depending on the metal.

Still further, since the deformable member is a shape memory alloy which is deformed by temperature, reliable deformation due to temperature change can be performed.

[0040]

As described above, when the light source means is at a predetermined temperature or higher, the lock means for locking the light source means and the cover is provided. The effect of being able to take out the lamp box is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a lamp peripheral portion when a temperature is equal to or higher than a predetermined temperature in a projection display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a lamp peripheral portion when the temperature is equal to or lower than a predetermined temperature in the projection display device according to the first embodiment of the present invention.

FIG. 3 shows the projection display device of FIGS. 1 and 2;
5 is a chart showing a bimetal temperature and its operation.

FIG. 4 is a cross-sectional view showing a lamp peripheral portion when the temperature is equal to or higher than a predetermined temperature in the projection display device according to the second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a lamp peripheral portion when the temperature is equal to or lower than a predetermined temperature in the projection display device according to the second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a lamp peripheral portion when the temperature is equal to or higher than a predetermined temperature in the projection display apparatus according to Embodiment 3 of the present invention.

FIG. 7 is a cross-sectional view illustrating a lamp peripheral portion when the temperature is equal to or lower than a predetermined temperature in the projection display device according to the third embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a lamp peripheral portion when the temperature is equal to or higher than a predetermined temperature in a projection display device according to a fourth embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a lamp peripheral portion when the temperature is equal to or lower than a predetermined temperature in the projection display apparatus according to Embodiment 4 of the present invention.

FIG. 10 is a cross-sectional view showing a lamp peripheral portion when the temperature is equal to or higher than a predetermined temperature in a projection display device according to a fifth embodiment of the present invention.

FIG. 11 is a cross-sectional view showing a lamp peripheral portion when the temperature is equal to or lower than a predetermined temperature in a projection display device according to a fifth embodiment of the present invention.

FIG. 12 is a perspective view showing each element of a conventional projection display device.

[Explanation of symbols]

1 lamp, 2 lamp box, 3 optical engine, 4 housing, 5 opening, 6 lamp cover,
7 bimetal, 8 lock mechanism, 11 lever,
12 winding spring, 14 key part, 20 slide lever, 21 spring, 22 key part, 30
Slide lever, 31 spring, 32 holes,
40 key parts, 50 shape memory alloy

Claims (7)

[Claims] 1. A light source means for emitting light for enlarging and displaying an image, a housing for supporting and fixing the light source means, and a cover for covering the light source means fixed to the housing, A projection type display device comprising: a deformable member attached to the light source means and deformed by temperature; and a locking portion attached to the cover and engaged by the deformable member at a predetermined temperature or higher and hooked by the deformable member. 2. The deformable member is supported at both ends by the light source means, and presses a locking member locked with the locking portion at the curved portion by a curved deformation due to a temperature change. 2. The projection display device according to 1. 3. The locking device according to claim 2, wherein the locking member is rotatably fixed to the light source means, and is rotated by being pushed by the curved portion to lock with the locking portion. The projection type display device according to the above. 4. The projection display device according to claim 2, wherein the locking member is fixed to the light source means so as to slide by the curved portion, and is locked with the locking portion. 5. The projection type according to claim 2, wherein one end of the deformation member is supported by the light source means, and the other end is locked to the locking portion by a curved deformation due to a temperature change. Display device. 6. The method according to claim 1, wherein the deformable member is a bimetal formed by laminating metals having different coefficients of thermal expansion.
3. The projection display device according to 1. 7. The projection display according to claim 1, wherein the deformable member is a shape memory alloy that deforms with temperature.