JP2013148677A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact projector in which a vent hole in use is properly secured, while preventing foreign matters from entering from the outside.SOLUTION: A projector includes vent holes 3 and 4 for cooling the inside and moving mechanisms 5 and 6 moved between a use position where a part 7 of a projection optical member is projected from a projector body 1 and a storage position where the projected member 7 is returned into a non-projected state. The moving mechanisms 5 and 6 cover the vent holes 3 and 4, in such a state that the moving mechanisms 5 and 6 are moved to the storage position and open the vent holes 3 and 4, in such a state that the moving mechanisms 5 and 6 are moved to the use position.

Description

  The present invention relates to a projector.

  A projector that cools an optical block while preventing entry of foreign matter such as dust from the outside is known (see Patent Document 1). The optical unit is housed in a cooling duct having a sealed structure, and this cooling duct is disposed in a casing having a substantially sealed structure. The optical unit in the cooling duct is cooled by taking the air in the housing into the cooling duct from the air inlet of the cooling duct. The air after heat exchange is returned into the housing from the air outlet of the cooling duct.

JP 2005-352446 A

  In the prior art, since the cooling duct is arranged in a substantially sealed casing, foreign matter can be prevented from entering the cooling duct, but a large capacity space for convection and circulation of air inside the casing is required. There has been a problem that it is difficult to apply to a small projector for the projector.

  The projector according to the present invention moves between a vent for cooling the inside, a use position where a part of the projection optical member protrudes from the projector main body, and a storage position where the protruding member returns to the non-projection state. And a moving mechanism is characterized in that the vent is closed when moved to the storage position and the vent is opened when moved to the use position.

  ADVANTAGE OF THE INVENTION According to this invention, the small projector which ensures the vent hole at the time of use can be provided, preventing the intrusion of the foreign material from the outside.

It is the perspective view which looked at the small projector by a first embodiment from the approximate front. FIG. 2 is a cross-sectional view illustrating when the projector of FIG. 1 is stored. It is a figure which illustrates the air current in a main body when a cooling fan rotates. It is the perspective view which looked at the small projector by 2nd embodiment from the approximate front. It is sectional drawing explaining the time of use of the projector of FIG. FIG. 5 is a cross-sectional view illustrating when the projector of FIG. 4 is stored.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
<First embodiment>
FIG. 1 is a perspective view of a small projector according to a first embodiment of the present invention viewed from substantially the front. In FIG. 1, the projector has an openable / retractable reflection mirror support 6 at the top of a main body 1. The reflection mirror support 6 is opened and closed by rotating around the rotation shaft 5. The reflection mirror support 6 opens to the use position shown when the projector is used, and maintains the open posture by a click mechanism (not shown).

  As shown in FIG. 1, when the reflection mirror support 6 is opened, the upper surface of the main body 1 appears and puts the projector into use. A projection port of the projector is provided on the upper surface of the main body 1, and a part of the projection optical system 2 is exposed. An intake port group 3 is provided on the right side of the projection optical system 2, and an exhaust port group 4 is provided on the left side of the projection optical system 2. A reflection mirror 7 is provided on the back side of the reflection mirror support 6. For example, when the projector is placed on a desk, the projection light from the projection optical system 2 is reflected by the reflection mirror 7 and projected onto the desk. Although the projection optical system 2 and the reflection mirror 7 are shown as if they are part of a cylindrical surface, they are actually constituted by free-form surfaces.

  FIG. 2 is a cross-sectional view illustrating when the projector of FIG. 1 is stored (the reflection mirror support 6 is closed). In FIG. 2, the reflection mirror support 6 in the closed posture covers the upper surface of the main body 1, whereby the reflection mirror 7, the projection optical system 2, the intake port group 3, and the exhaust port group 4 are each closed in a closed space.

  The main part of the optical system of the projector will be described. A blue LED 21B, a green LED 21G, and a red LED 21R constituting a light source are respectively attached to the heat sink 12. The blue LED 21B is an LED that emits blue light. The green LED 21G is an LED that emits green light. The red LED 21R is an LED that emits red light. The heat sink 12 absorbs heat generated when each LED 21B, LED 21G, and LED 21R emits light.

  The light from each light source is configured to form a single light beam traveling along the optical axis. The light sources for the three colors may be constituted by one-chip type LEDs, or may be constituted by LDs (semiconductor lasers) instead of the LEDs.

  The dichroic mirror 22 transmits blue light and reflects green light. The dichroic mirror 23 transmits red light and reflects blue light and green. As a result, the three colors of light are guided onto the same optical path. In FIG. 2, the center line of the light beam is the optical axis, and the optical path is represented by a straight line indicating the optical axis.

  The microlens array 24 is disposed on the optical path and divides the light flux from each light source into a plurality of partial light fluxes. The plurality of partial light beams are incident on a PBS (polarization beam splitter) 25 through a superimposing optical system (not shown). The incident light beam is separated by the polarization separation unit 25a into P-polarized light that passes through the polarization separation unit 25a and S-polarized light that reflects from the polarization separation unit 25a. The S-polarized light reflected from the polarization separation unit 25a is bent downward to uniformly illuminate the LCOS 10 that is a reflective liquid crystal. On the other hand, the P-polarized light transmitted through the polarization separation unit 25a is discarded as unnecessary light.

  The LCOS 10 modulates illumination light based on the projection source. As a result, among the light reflected from the LCOS 10 and incident again on the PBS 25, the P-polarized light that is the modulated light is transmitted through the polarization separation unit 25a and guided to the projection optical system 2. The projection source is, for example, an image recorded on a memory card (not shown) or an image input from an external device (not shown).

  Since the present embodiment is characterized by the air cooling structure of the heat sink 12 in the projector described above, the following description will be focused on the air cooling structure.

<Use state>
2 and 3, a cooling fan 13 is disposed below the exhaust port group 4. The cooling fan 13 is energized when the LED 21B, LED 21G, and LED 21R emit light when the projector is used (the reflection mirror support 6 is in the open position), and rotates in a direction to discharge the air in the main body 1 from the exhaust port group 4 to the top. . FIG. 3 is a diagram illustrating the airflow in the main body 1 when the cooling fan 13 rotates.

  In FIG. 3, an air conditioning plate 14 a that allows the airflow to pass through the bottom of the main body 1 is provided so that the airflow from the inlet group 3 to the exhaust group 4 efficiently cools the heat sink 12. Further, an air conditioning plate 14b is provided to smooth the air flow at the right bottom of the main body 1, and an air conditioning plate 14c is provided to smooth the air flow at the left bottom of the main body 1. The air conditioning plates 14 a to 14 c prevent the outside air sucked from the intake port group 3 from going to the exhaust port group 4 without cooling the heat sink 12, and make sure to exchange heat with the heat sink 12. Is leading.

  In the above description, the positional relationship between the intake port group 3 and the exhaust port group 4 may be reversed. Further, the mounting position of the cooling fan 13 may be changed to a configuration where the cooling fan 13 is mounted so as to be forcedly sucked in addition to being mounted so as to be forcedly exhausted by the fan 13.

<Storage state>
The reflection mirror support 6 is closed to the position shown in FIG. 2, and the closed posture is maintained by a lock mechanism (not shown). Since the reflection mirror support 6 closes the reflection mirror 7, the projection optical system 2, the air inlet group 3, and the exhaust port group 4 in the space, adhesion of dust to the reflection mirror 7 and the projection optical system 2 is prevented. Further, foreign matter can be prevented from entering the main body 1 from the inlet group 3 and the outlet group 4.

According to the first embodiment described above, the following operational effects can be obtained.
(1) The projector has an intake port group 3 and an exhaust port group 4 for cooling the inside of the main body 1, a use position where the reflection mirror 7 of the projection optical system 2 protrudes from the projector main body 1, and the protruding reflection mirror 7. The reflection mirror support 6 and the rotary shaft 5 are moved between the storage position for returning the non-projecting state to the non-projecting state, and the reflection mirror support 6 and the rotary shaft 5 are moved to the storage position when the intake port group 3 is moved. The exhaust port group 4 is closed, and the intake port group 3 and the exhaust port group 4 are opened in a state where the exhaust port group 4 is moved to the use position. As a result, while the projector is not in use (storage, transport, etc.), foreign matter such as dust and dust can be prevented from entering the inside of the main body 1 and the projector can be automatically cooled if the projector is in a use posture. The exhaust port group 4 is opened. A large-capacity space for convection and circulation of air inside the main body 1 is not necessary, and it is suitable for a small projector having a brightness of about several tens of lumens called a “pico projector”. Since no filter is provided in the intake port group 3 and the exhaust port group 4, an excessive burden is not imposed on the cooling fan 13.

(2) In the projector of (1), the reflection mirror support 6 and the rotation shaft 5 are constituted by the rotatable reflection mirror support 6 connected via the projector body 1 and the rotation shaft 5 to the storage position. Since the moved reflection mirror support 6 closes the intake port group 3 and the exhaust port group 4, the reflection mirror support 6 can be moved between the use position and the storage position by a simple operation of rotating the reflection mirror support 6. Since a complicated mechanism is not required, the reduction in size and weight of the projector is not hindered.

(3) In the projector of (2) above, the projection optical system 2 includes a reflection mirror 7 provided inside the reflection mirror support 6, and the reflection mirror 7 has moved to the use position. In this state, since the projection light is reflected toward the projection surface, it can be performed simultaneously with the movement of the reflection mirror support 6 (reflection mirror 7) to the use position and the opening operation of the intake port group 3 and the exhaust port group 4.

(4) In the projectors (1) to (3), the LEDs 21B, 21G, and 21R are provided as projection light sources, and the inlet group 3 and the outlet group 4 perform intake and exhaust to cool the LEDs 21B, 21G, and 21R. Therefore, the projector heat source should be properly cooled.

<Second Embodiment>
FIG. 4 is a perspective view of a small projector according to the second embodiment of the present invention viewed from substantially the front. In FIG. 4, the projector has an openable / retractable reflection mirror support 6 at the top of a main body 1B. The reflection mirror support 6 is opened and closed by rotating around the rotation shaft 5. The reflection mirror support 6 opens to the use position shown when the projector is used, and maintains the open posture by a click mechanism (not shown). An intake port group 32 is provided on the right side surface of the main body 1B, and an exhaust port group 33 (FIG. 5) is provided on the left side surface of the main body 1B.

<Use state>
As shown in FIG. 4, when the reflection mirror support 6 is opened, the upper surface of the main body 1B appears and puts the projector into use. A projection port of the projector is provided on the upper surface of the main body 1B, and a part of the projection optical system 2 is exposed. An opening for the intake side opening / closing door 26 is provided on the right side of the projection optical system 2, and the upper portion of the intake side opening / closing door 26 is exposed from this opening. An opening for the exhaust side opening / closing door 27 is provided on the left side of the projection optical system 2, and the upper portion of the exhaust side opening / closing door 27 is exposed from this opening.

  FIG. 5 is a cross-sectional view for explaining the use of the projector of FIG. 4 (the reflection mirror support 6 is in the open posture). In FIG. 5, the illustration of the reflection mirror support 6 is omitted. In addition, since the optical system of the second embodiment is the same as the optical system of the first embodiment, the symbol display and description thereof are also omitted. The intake side opening / closing door 26 is biased upward by an opening / closing door push-up spring 30. Therefore, when the reflection mirror support 6 is opened, the intake side opening / closing door 26 is lifted to the position shown in FIGS. 4 and 5, and the upper portion of the intake side opening / closing door 26 is exposed from the upper surface of the main body 1B. Similarly, the exhaust side opening / closing door 27 is biased upward by the opening / closing door push-up spring 31. For this reason, the exhaust side opening / closing door 27 is lifted to the position shown in FIGS. 4 and 5 when the reflection mirror support 6 is opened, and the upper part of the exhaust side opening / closing door 27 is exposed from the upper surface of the main body 1B.

  In FIG. 5, the intake side opening / closing door 26 has an intake side opening / closing door opening group 28 at a position corresponding to the intake port group 32 of the main body 1 </ b> B in a state where the intake side opening / closing door 26 is lifted by the opening / closing door push-up spring 30. Is provided. Similarly, the exhaust side opening / closing door 27 is provided with an exhaust side opening / closing door opening group 29 at a position corresponding to the exhaust port group 33 of the main body 1 </ b> B in a state where the exhaust side opening / closing door 27 is lifted by the opening / closing door push-up spring 31. It has been.

  A cooling fan 35 is disposed on the right side of the exhaust side opening / closing door opening group 29 in the main body 1B. The cooling fan 35 is energized when the LED 21B, LED 21G, and LED 21R (not shown) emit light when the projector is used (the reflection mirror support 6 is in the open posture), and the air inside the main body 1B is exhausted through the exhaust side opening / closing door opening group 29, and It rotates in the direction of discharging to the outside of the main body 1B through the exhaust port group 33. The arrows in FIG. 5 are diagrams illustrating the airflow in the main body 1B when the cooling fan 35 rotates.

  In FIG. 5, an air conditioning plate 34 for concentrating the airflow to the lower part of the main body 1 </ b> B is provided so that the airflow from the intake side opening / closing door opening group 28 to the exhaust side opening / closing door opening group 29 efficiently cools the heat sink 12. The air conditioning plate 34 guides the outside air introduced into the main body 1 </ b> B to efficiently exchange heat with the heat sink 12 to cool the heat sink 12. With the configuration described above, air outside the main body 1B can be discharged in a state where the intake side opening / closing door 26 is lifted by the opening / closing door push-up spring 30 and the exhaust side opening / closing door 27 is lifted by the opening / closing door push-up spring 31. It becomes possible to suck into the main body 1B and discharge the air inside the main body 1B to the outside.

<Storage state>
FIG. 6 is a cross-sectional view for explaining when the projector of FIG. 4 is housed (the reflection mirror support 6 is closed). In FIG. 6, the reflecting mirror support 6 in the closed posture abuts on the upper end 26 a of the intake side opening / closing door 26 and the upper end 27 a of the exhaust side opening / closing door 27. The intake side opening / closing door 26 and the exhaust side opening / closing door 27 are respectively pushed downward by the reflecting mirror support portion 6 and lowered to a position where the upper end 26a and the upper end 27a become the upper surface of the main body 1B. At this time, the intake port group 32 provided in the main body 1B and the intake side opening / closing door opening group 28 provided in the intake side opening / closing door 26 are alternated, and similarly, the exhaust port group 33 provided in the main body 1B The exhaust side opening / closing door opening group 29 provided in the exhaust side opening / closing door 27 is alternated. Thereby, the opening for ventilation to the inside of the main body 1B is closed.

  In the above description, the positional relationship between the intake port group 32 (intake side opening / closing door 26) and the exhaust port group 33 (exhaust side opening / closing door 27) may be reversed. Further, the mounting position of the cooling fan 35 may be changed to a configuration in which the cooling fan 35 is mounted so as to be forcedly sucked in addition to being mounted so as to be forcedly exhausted by the fan 35.

According to the second embodiment described above, the following operational effects can be obtained.
(1) The projector has an intake port group 32 and an exhaust port group 33 for cooling the inside of the main body 1B, a use position where the reflecting mirror 7 of the projection optical system 2 protrudes from the projector main body 1B, and the protruding reflecting mirror 7 The reflection mirror support 6 and the rotary shaft 5 are moved between the storage position to return the non-projecting state to the non-projecting state, and the reflection mirror support 6 and the rotary shaft 5 are moved to the storage position and the intake port group 32. The exhaust port group 33 is closed, and the intake port group 32 and the exhaust port group 33 are opened in a state where the exhaust port group 33 is moved to the use position. As a result, the inlet group 32 for cooling is automatically provided when the projector is in a use posture while preventing the entry of foreign matter such as dust and dust into the main body 1B when the projector is not used (storage, transfer, etc.). The exhaust port group 33 is opened. A large-capacity space for convection and circulation of air inside the main body 1B is not necessary, and it is suitable for a small projector with a brightness of about several tens of lumens called a “pico projector”. Since the intake port group 32 and the exhaust port group 33 are not provided with a filter, an excessive burden is not imposed on the cooling fan 35.

(2) In the projector of (1), the projector further includes an intake side opening / closing door 26 and an exhaust side opening / closing door 27 for opening and closing the intake port group 32 and the exhaust port group 33, and the reflection mirror support 6 and the rotary shaft 5 are used. Since the intake side opening / closing door 26 and the exhaust side opening / closing door 27 are opened and closed in conjunction with the movement between the position and the storage position, the reflection mirror support 6 (reflection mirror 7) is moved to the use position, It can be performed simultaneously with the opening operation of the intake side opening / closing door 26 and the exhaust side opening / closing door 27.

(3) In the projector described above, the reflection mirror support 6 and the rotation shaft 5 are constituted by a rotatable reflection mirror support 6 connected to the projector main body 1B via the rotation shaft 5, and the projection optical system 2 has a reflection function. A reflection mirror 7 provided inside the mirror support 6 is included, and the reflection mirror 7 reflects the projection light toward the projection surface in a state where the reflection mirror support 6 has moved to the use position. Since it is possible to move between the use position and the storage position by a simple operation of rotating the reflection mirror support 6, a complicated mechanism is not required, so that reduction in size and weight of the projector is not hindered.

(4) In the projector of (3) above, the intake-side open / close door 26 and the exhaust-side open / close door 27 open and close in conjunction with the rotation of the reflection mirror support 6, so that the reflection mirror support 6 can be simply rotated. The projector can be interlocked with various operations and does not require a complicated mechanism, so that the reduction in size and weight of the projector is not hindered.

(Modification 1)
In the above description, an example in which a reflective liquid crystal display element (LCOS) is used as a light valve has been described. However, a configuration using a DMD (Digital Micromirror Device) may be used. Further, a transmissive display element may be used.

(Modification 2)
In the above description, an example has been described in which a mechanism for moving the reflection mirror 7 between the use position and the storage position as an optical member is provided, and the intake and exhaust ports are opened and closed in conjunction with the movement mechanism. Instead, the projection optical system may be extended when used and retracted when stored, and the intake / exhaust ports may be opened and closed in conjunction with this extension-retraction operation.

  The above description is merely an example, and is not limited to the configuration of the above embodiment.

DESCRIPTION OF SYMBOLS 1, 1B ... Main body 2 ... Projection optical system 3, 32 ... Intake port group 4, 33 ... Exhaust port group 5 ... Rotating shaft 6 ... Reflection mirror support part 7 ... Reflection mirror 12 ... Heat sink 13, 35 ... Cooling fan 14a-c 34 ... Air conditioning plate 26 ... Intake side opening / closing door 27 ... Exhaust side opening / closing door 28 ... Intake side opening / closing door opening group 29 ... Exhaust side opening / closing door opening groups 30, 31 ... Opening / closing door push-up spring

Claims (7)

A vent for cooling the interior,
A moving mechanism that moves between a use position where a part of the projection optical member protrudes from the projector main body and a storage position where the protruding member returns to a non-projecting state,
The projector is characterized in that the moving mechanism closes the vent in a state where the moving mechanism is moved to the storage position, and opens the vent in a state where the moving mechanism is moved to the use position. The projector according to claim 1, wherein
The moving mechanism is composed of a rotatable optical system support unit connected to the projector body via a rotation shaft,
The projector according to claim 1, wherein the optical system support moved to the storage position closes the vent. The projector according to claim 2,
The projection optical member includes a reflection member provided on the optical system support,
The projector, wherein the reflecting member reflects projection light toward a projection surface in a state where the optical system support portion is moved to the use position. The projector according to claim 1, wherein
A vent opening / closing door that opens and closes the vent;
The projector is characterized in that the moving mechanism opens and closes the vent opening / closing door in conjunction with the movement between the use position and the storage position. The projector according to claim 4, wherein
The moving mechanism is composed of a rotatable optical system support unit connected to the projector body via a rotation shaft,
The projection optical member includes a reflection member provided on the optical system support,
The projector, wherein the reflecting member reflects projection light toward a projection surface in a state where the optical system support portion is moved to the use position. The projector according to claim 5, wherein
The projector according to claim 1, wherein the vent opening / closing door opens and closes in conjunction with rotation of the optical system support. In the projector as described in any one of Claims 1-6,
LED or laser as projection light source,
The projector according to claim 1, wherein the air vent performs intake and exhaust to cool the projection light source.

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