JP2009128763A - projector - Google Patents

Abstract

The heat dissipation efficiency of a heat sink provided in a projector is increased.
An upper housing 2 in which components including at least a light source 21 and a display element 24 are accommodated, a lower housing 1 provided to be movable with respect to the upper housing 2, and an upper housing 2 are stored. By moving from the position to the use position, the heat dissipating space forming means 1 to 3 forming the heat dissipating space SP surrounded by the upper housing 2 and the lower housing 1, and the heat dissipating space SP are arranged, The heat dissipating member 5 that dissipates the heat from the component parts to the heat dissipating space SP, and the upper housing 2 from the storage position to the use position, Opening forming means 1 to 3 for forming openings 11 and 12 communicating with each other.
[Selection] Figure 3

Description

  The present invention relates to heat dissipation of a projector.

  Since the projector has a heat generating part such as a light source in the housing, it is necessary to efficiently dissipate the heat generated in the heat generating part to the outside in order to suppress the temperature rise in the housing and obtain good display characteristics. Conventionally, there has been known an electronic apparatus in which a heat radiating member is accommodated in a housing and heat is radiated from the heat radiating member to the outside through a vent provided in the housing (see, for example, Patent Document 1). In the device described in Patent Document 1, the casing is slid with the vent as a boundary, and the area of the vent is increased to improve the heat dissipation performance of the heat radiating member.

Japanese Patent No. 3845262

  However, since the thing of the said patent document 1 cannot ensure sufficient heat dissipation space around a heat radiating member, it is easy to accumulate heat in a housing | casing and cannot fully improve heat dissipation.

A projector according to the present invention includes a first casing that houses components including a light source and a display element, a second casing that is movably provided with respect to the first casing, and a first casing. Heat dissipation that forms a heat dissipation space surrounded by the first casing and the second casing by moving the body from the first position corresponding to the non-use state to the second position corresponding to the use state By moving the first housing from the first position to the second position, the space forming means, the heat dissipating member arranged to face the heat dissipating space and dissipating heat from the component parts to the heat dissipating space, An opening forming means for forming an opening connecting the heat radiation space and the outer space of the first and second housings is provided.
The heat radiating member is preferably attached to the outer surface of the first housing facing the heat radiating space.
Preferably, the light source is provided in contact with the heat dissipation member.
The second housing is preferably made of a material having a lower thermal conductivity than the heat dissipation member.
Support means for supporting the first casing at the second position may be provided, and the first casing may be supported in an inclined posture so that the image projection direction is obliquely upward.
It is also possible to further include a blowing means for blowing air into the heat dissipation space through the opening.
The first housing may be provided so as to be pivotable at the other end side with respect to the second housing with the one end side as a fulcrum, and may be stored in the second housing at the first position.
The light source is preferably an LED.

  According to the present invention, the heat dissipation of the heat dissipation member can be sufficiently enhanced.

-First embodiment-
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an external perspective view of the projector according to the first embodiment. Projector 100 according to the present embodiment is a palm-sized portable projector. FIG. 1A shows a folded state (non-use state) when carrying the projector, and FIG. 1B shows a use state. Yes. In the following, for convenience of explanation, front and rear, left and right directions are defined as shown, and the configuration of each part will be described according to this definition.

  The projector 100 includes a substantially box-shaped lower housing 1 whose upper surface is open, and a substantially box-shaped upper housing 2 that is housed and stored in the lower housing. The lower housing 1 and the upper housing 2 are each formed by resin molding and are made of a resin material having low thermal conductivity and high heat insulation.

  The upper housing 2 can be pivoted in the vertical direction with respect to the lower housing 1 with a pivot shaft 3 provided at the rear end of the left and right side surfaces as a fulcrum. As shown in FIG. 1B, the rotation shaft portion 3 is provided with a lock mechanism (not shown) that supports the upper housing 2 while being inclined at a predetermined angle. In the usage state, the height of the upper front end of the upper housing 2 and the height of the lower front end of the lower housing are substantially the same, and the projection lens 4 on the front surface of the upper housing 2 is exposed to the outside. In this case, the inclination angle of the upper housing 2 is set so that the projection light from the projection lens 4 is suitably projected obliquely upward when the lower housing 1 is supported horizontally. On the left and right side surfaces of the upper housing 2, protrusions 2 a for causing the upper housing 2 stored in the lower housing 1 from the lower housing 1 are provided.

  A plurality of horizontally long slit holes 11 are opened in the left-right direction on the front surface of the lower housing 1. A plurality of horizontally long slit holes 12 are opened on the bottom surface of the lower housing 1 over the left and right side surfaces. Although illustration is omitted, various operation members such as an on / off switch for turning on / off the projector 100 are provided on the surface of the upper housing 2.

  2 is a cross-sectional view taken along line II-II in FIG. 1A, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. A heat sink 5 is provided on the bottom surface of the upper housing 2, and the heat sink 5 forms a part of the upper housing 2. The heat sink 5 is made of a material having high thermal conductivity such as aluminum and high heat dissipation, and a high-intensity light emitting diode (hereinafter referred to as LED 21) is disposed on the upper surface of the heat sink 5 in contact with the heat sink 5. . A reflection mirror 22 is inclined above the LED 21, and a transmissive display element 23 and a projection optical system 24 (such as the projection lens 4) are disposed in front of the reflection mirror 22. Illumination light from the LED 21 is reflected forward by the reflection mirror 22, passes through the display element 23 and the projection optical system 24, and is projected onto a screen or the like.

  The main operations of projector 100 according to the first embodiment will be described. When the projector 100 is not in use, the upper housing 2 is stored in the lower housing 1 and the front surface of the projection lens 4 is covered by the lower housing 1 as shown in FIG. . When the projector 100 is used, the upper housing 2 is raised from the lower housing 1, and is placed on the stand with the upper housing 2 tilted as shown in FIG. 3 (this is called a use position). As a result, the gap between the upper housing 2 and the lower housing 1 is enlarged in the use state, and a heat radiation space SP whose periphery is covered by the upper housing 2 and the lower housing 1 is formed.

  In this state, when the switch is turned on to cause the LED 21 to emit light, the heat from the LED 21 is transferred to the heat radiating plate 5 and is radiated from the heat radiating plate 5 to the heat radiating space SP. At this time, air flows into the heat radiation space SP from the outside through the slit hole 12 and flows out through the slit hole 11 as shown by the arrows. Thereby, the heat in the heat dissipation space can be discharged to the outside of the housings 1 and 2, and the heat dissipation of the heat dissipation plate 5 can be enhanced. Further, in the heat dissipation space, air flows along the surface of the heat sink 5 by natural convection, so that heat can be efficiently radiated from the heat sink 5 to the heat dissipation space SP, and the temperature due to heat generated by the components inside the upper housing 1. The rise can be suppressed.

According to 1st Embodiment, there can exist the following effects.
(1) The upper housing 2 is provided so as to be rotatable in the vertical direction with respect to the lower housing 1, the heat sink 5 is attached to the bottom surface of the upper housing 2, and the LED 21 is provided in contact with the heat sink 5. did. Thereby, the space | gap between the heat sink 5 and the lower housing | casing 1 can expand, the heat sink SP can be formed facing the heat sink 5, and the heat dissipation of the heat sink 5 can be improved.
(2) Since the upper housing 2 is supported while being tilted with respect to the lower housing 1 in use, air flows along the surface of the heat radiating plate 5 by natural convection in the heat radiating space. The heat can be efficiently radiated from 5 into the heat radiation space.
(3) Since the upper housing 2 is tilted and supported, the image from the projector 100 can be projected at an easily viewable position obliquely upward.

(4) Since the heat radiating plate 5 is provided facing the heat radiating space SP, the heat radiating plate 5 is not exposed to the outside, and it is possible to prevent a finger from touching the high temperature heat radiating plate 5 by mistake.
(5) Since the heat sink 5 is mounted on the bottom surface of the upper housing 2 and the lower housing 1 is made of a highly heat-insulating resin material, the temperature rise of the lower housing 1 can be suppressed, and the projector 100 can be carried. Is easy.
(6) Since the temperature rise of the lower housing 1 is suppressed, an image can be projected while the projector 100 is placed on the palm.

(7) Since the heat radiating plate 5 is provided on the outer surface of the upper housing 2, the temperature rise of the components in the housing can be suppressed as compared with the case where the heat radiating plate 5 is provided in the housing, and a good projection image is obtained. be able to.
(8) Since the heat radiating plate 5 is provided on the outer surface of the upper casing 2, the upper casing 2 can be sealed, and dust can be prevented from adhering to the optical member or the like in the upper casing.
(9) Since the LED 21, which generates less heat than the lamp, is used as the light source, it is suitable for use in the upper housing 2 with a sealed structure.

  In the first embodiment, the heat radiating plate 5 is provided on a part of the bottom surface of the upper housing 2 so as to cover the entire bottom surface of the LED 21. For example, as shown in FIG. The heat radiating plate 5 may be enlarged to the entire bottom surface of 2. Thereby, heat can be radiated from the entire bottom surface of the upper housing 2 to the heat radiation space SP, and heat radiation from the heat radiating plate 5 can be promoted.

  As shown in FIG. 4B, the bottom surface of the upper housing 2 is formed by the heat sink 5 and the heat-generating component 25 such as a power transistor is disposed in contact with the upper surface of the heat sink 5 and the circuit board 26 is disposed above the heat-generating component 25. It may be arranged. As a result, not only the LED 21 but also heat from other heat generating components 25 can be radiated to the heat radiating space SP via the heat radiating plate 5, and temperature rise in the upper housing can be efficiently suppressed. After the components are accommodated in the upper casing, the heat radiating plate 5 may be attached to the bottom surface of the upper casing 2 with a screw or the like to cover the upper casing 2, thereby improving the assembling property of the projector 100.

-Second Embodiment-
A second embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, air is configured to flow in the heat dissipation space by natural convection, but in the second embodiment, the air is configured to flow in the heat dissipation space by forced convection. Hereinafter, differences from the first embodiment will be mainly described.

  5 and 6 are cross-sectional views showing the internal configuration of the projector 100 according to the second embodiment. In particular, FIG. 5 shows a non-use state of the projector, and FIG. 6 shows a use state. FIG. 7 is an external perspective view of projector 100 in use. In addition, the same code | symbol is attached | subjected to the location same as FIGS.

  Hinge portions 13 are provided on the left and right side surfaces of the lower housing 1, and the lower housing 1 is divided into a front housing portion 1A on the front side of the hinge portion 13 and a rear housing portion 1B on the rear side. The front housing part 1A can be rotated upward with the hinge part 13 as a fulcrum. When the front housing part 1A is rotated substantially vertically as shown in FIG. The bottom surface of the upper housing 2 can be supported in an inclined state. A fan 6 for blowing air is attached to the front housing portion 1A, and a slit hole 11 is opened in the front housing portion 1A so as to face the fan 6.

  When the front housing part 1 </ b> A is raised through the hinge part 13, a heat radiation space SP is formed between the upper housing 2 and the lower housing 1. When the fan 6 is driven in this state, a gap 14 (FIG. 7) between the left and right side surfaces of the upper housing 2 and the lower housing 1 and a slit hole 12 (FIG. 6) provided on the bottom surface of the rear housing portion 1B are formed. Air is sucked into the heat dissipation space SP from outside. The sucked air flows in the heat radiating space along the heat radiating plate 5 and is discharged to the outside through the slit hole 11. Thereby, heat can be efficiently radiated from the heat sink 5 to the heat dissipation space SP. In this case, since the flow velocity of the air in the heat dissipation space is fast, heat transfer from the heat dissipation plate 5 to the air in the heat dissipation space is promoted, and the heat dissipation efficiency is good.

-Modification-
In the above embodiment, the upper housing 2 is provided so as to be rotatable with respect to the lower housing 1, and the upper housing 2 is rotated upward so that the heat dissipation space communicates with the outside through the slit holes 11 and 12. SP was formed. Not limited to this, the upper housing 2 may be slidable with respect to the lower housing 1, and the upper housing 2 may be slid to form the heat radiation space SP communicating with the outside.

  8 and 9 are diagrams showing an example thereof. In FIG. 8, the slide surface has a planar shape, and in FIG. 9, the slide surface has a curved shape. 8A and 9A show the non-use state of the projector 100, and FIGS. 8B and 9B show the use state. 8 and 9, when the upper housing 2 is slid forward, the upper housing 2 is inclined and an opening 15 is formed on the upper surface of the rear end portion of the lower housing 1. Thereby, air flows through the heat radiation space SP in the lower housing via the opening 15 and the slit hole 12, and the heat radiation efficiency of the heat radiation plate 5 can be increased. Also in the modified example, the heat radiating plate 5 is arranged so as not to be exposed to the appearance, and the finger does not touch the heat radiating plate 5 directly.

  Note that a reflective display element, so-called LCOS (liquid crystal on silicon) can be used as the display element instead of the transmissive display element 23. FIG. 10 is a diagram illustrating an example thereof. Illumination light from the LED 21 passes through the condenser lens 25 and the PBS (polarization beam splitter) block 26 to reach the reflective liquid crystal element (LCOS 27), is reflected by the LCOS 27, and reenters the PBS block 26, and the projection optical system 24. Projected onto a screen or the like.

  In the above embodiment, the surface of the heat sink 5 is flat, but the surface may be uneven to increase the surface area of the heat sink 5. For example, as shown in FIG. 11, the projections and recesses corresponding to the slit holes 12 may be formed, and the convex portions 51 on the surface of the heat sink 5 may be fitted into the slit holes 12 when not in use. Thereby, the surface area of the heat sink 5 increases, and the heat dissipation efficiency can be further enhanced.

  The upper housing 2 may be moved from the storage position to the use position using an electric actuator, a spring, or the like. The projector 100 may be turned on in conjunction with the movement to the use position. In the above embodiment, the pair of movable casings 2 and 1 are provided above and below, but the first casing and the second casing may be provided other than the top and bottom. Although the upper housing 2 is moved from the storage position (first position) to the use position (second position), the heat radiation space SP surrounded by the housings 1 and 2 is formed. The forming means is not limited to this.

  Although the heat radiating space SP and the slit holes 11 and 12 (opening portions) of the lower housing 1 communicate with each other by moving the upper housing 2 to the use position, the opening forming means is not limited to this. It is possible to provide a gap as an opening on the extension of the bottom surface of the heat radiating plate 5 instead of the front surface of the lower housing 1, that is, between the front upper end portion of the lower housing 1 and the lower front end portion of the upper housing 2. Good. Thereby, the air flow along the surface of the heat sink 5 is promoted, and the heat dissipation efficiency can be increased. In this case, it is preferable that the size of the opening is at least 5 mm or less so that the finger does not touch the heat radiating plate 5.

  Although the heat radiating plate 5 is mounted on the upper housing 2, it may be mounted on the lower housing 1 as long as the heat radiating plate 5 is mounted facing the heat radiating space SP. In this case, the heat generated in the upper housing 2 may be transferred to the heat radiating plate 5 of the lower housing 1 through the heat transfer member and radiated from the heat radiating plate 5 to the heat radiating space SP. Although LED21 was made to contact | abut to the heat sink 5, arrangement | positioning of the components in an upper housing | casing is not restricted to this. A lamp may be used as the light source instead of the LED 21. Although the upper housing 2 is supported in an inclined posture by the lock mechanism provided on the rotation shaft portion 3, any support means may be used. Any configuration of the fan 6 as the air blowing means may be used. That is, the present invention is not limited to the projector according to the embodiment as long as the features and functions of the present invention can be realized.

1 is an external perspective view of a projector according to a first embodiment. II-II sectional view taken on the line of Fig.1 (a). III-III sectional view taken on the line of FIG.1 (b). The figure which shows the modification of 1st Embodiment. Sectional drawing which shows the internal structure of the projector which concerns on 2nd Embodiment. Sectional drawing which shows the use condition of the projector which concerns on 2nd Embodiment. FIG. 6 is an external perspective view showing a usage state of a projector according to a second embodiment. The figure which shows the modification which provided the upper housing | casing so that a slide was possible. The figure which shows another modification which provided the upper housing | casing so that a slide was possible. The figure which shows the modification of FIG. The figure which shows the different shape of a heat sink.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower housing | casing 2 Upper housing | casing 3 Rotating shaft part 5 Heat sink 6 Fan 11, 12, 13 Slit hole 15 Opening part 21 LED
23 Display element SP Heat dissipation space

Claims (8)

A first housing containing components including a light source and a display element;
A second housing movably provided with respect to the first housing;
The first casing is surrounded by the first casing and the second casing by moving the first casing from the first position corresponding to the non-use state to the second position corresponding to the use state. A heat radiation space forming means for forming a heat radiation space;
A heat dissipating member that faces the heat dissipating space and dissipates heat from the component parts to the heat dissipating space;
An opening that forms an opening connecting the heat dissipation space and the outer space of the first and second casings by moving the first casing from the first position to the second position. And a forming unit. The projector according to claim 1, wherein
The projector, wherein the heat radiating member is attached to an outer surface of the first casing facing the heat radiating space. The projector according to claim 2,
The projector, wherein the light source is provided in contact with the heat radiating member. The projector according to any one of claims 1 to 3,
The projector according to claim 1, wherein the second casing is made of a material having a lower thermal conductivity than the heat dissipation member. The projector according to any one of claims 1 to 4,
Support means for supporting the first housing at the second position;
The projector is characterized in that the support means supports the first casing in an inclined posture so that an image projection direction is obliquely upward. In the projector of any one of Claims 1-5,
The projector according to claim 1, further comprising a blowing unit that blows air into the heat dissipation space through the opening. The projector according to any one of claims 1 to 6,
The first casing is provided such that the other end can be pivoted around one end with respect to the second casing, and the first casing is stored in the second casing at the first position. Projector. In the projector of any one of Claims 1-7,
The projector, wherein the light source is an LED.

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