CN103529625A - Projector - Google Patents
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- CN103529625A CN103529625A CN201310429364.7A CN201310429364A CN103529625A CN 103529625 A CN103529625 A CN 103529625A CN 201310429364 A CN201310429364 A CN 201310429364A CN 103529625 A CN103529625 A CN 103529625A
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- projector
- sensing element
- lampshade
- thermal sensing
- light source
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Abstract
The invention provides a projector, which comprises a shell, a light source module, an airflow generation device, a sensing module and a power module. The light source module is arranged in the shell and comprises a light emitting element and a lamp shade embracing the light emitting element. The airflow generation device is capable of generating airflow to radiate heat of the light source module. The sensing module is arranged in the shell and comprises a thermosensitive element, and the thermosensitive element is close to the lamp shade and is located on a flow path of the airflow. The power module is arranged in the shell and is electrically connected to the light source module and the sensing module, and the power module selectively stops powering up the light source module according to electric parameters of the thermosensitive element. According to the projector, the projector is protected from overheating by utilizing the heat sensitivity of the thermosensitive element.
Description
Technical field
The present invention is about a kind of projector, espespecially a kind of projector with overheat protective function.
Background technology
General projector has thermal breaker more, and this thermal breaker occurs when overheated in board, can protect board can not occur to make because of overheated the situation that board is impaired or burn.Therefore, thermal breaker all can be arranged at the inner the hottest close element attachment of board, with the overheated rapid reaction to board.With projector, the element that bulb is normally the warmmest, therefore thermal breaker is arranged near bulb more.Yet this thermal breaker adopts mechanical type protection mechanism more, its complex structure makes cost be difficult to reduce, and again, its volume, much larger than general electronic component, is still required to be it and retains the suitable space that arranges.In practical application, this thermal breaker conventionally need be independent of other electronic packages and be assembled in board, and the assembly cost of thermal breaker cannot be exempted.
Summary of the invention
In view of the problem in prior art, one of object of the present invention is to provide a kind of projector, utilizes thermal sensing element to realize overheat protective function, has rapid reaction, the advantages such as cost that space is little, reduce setting and assembling are set.
Projector of the present invention comprises casing, light source module, air flow-producing device, sensing module and power supply module.This light source module is arranged in this casing and comprises illuminating part and around the lampshade of this illuminating part.This air flow-producing device is in order to produce the air-flow in this casing of flowing through, so that this light source module is dispelled the heat.This sensing module is arranged in this casing and comprises thermal sensing element, and this thermal sensing element is close to this lampshade setting and is positioned on the flow path of this air-flow.This power supply module is arranged in this casing and is electrically connected to this light source module and this sensing module, and this power supply module optionally stops this light source module power supply according to the electric parameter of this thermal sensing element.
According to projector of the present invention, thermal sensing element is thermistor.
According to projector of the present invention, lampshade has a central shaft, the light ray parallel of illuminating part transmitting penetrates this lampshade in this central shaft, this lampshade has a projected outline in the plane of vertical this central shaft, this projected outline has an external diameter, and the distance of this thermal sensing element between the projection Yu Gai of this plane projected outline is between this external diameter of 0 to 1 times.，Gai projected outline is with respect to a symmetrical rotational symmetry further, and this thermal sensing element is this external diameter between 0 to 2 times in the projection of this plane and the distance between this axis of symmetry.
According to projector of the present invention, lampshade has a central shaft, the light ray parallel of this illuminating part transmitting penetrates this lampshade in this central shaft via the opening of this lampshade, this lampshade has a projected outline in the plane of parallel this central shaft, this projected outline is along having a length in the direction of parallel this central shaft, this projected outline be to having a reference edge by opening, certainly this reference edge along in contrast to this opening towards the distance of the projection of direction to this thermal sensing element in this plane between this length of 0 to 1.5 times.
According to projector of the present invention, light source module has an optical axis, and this optical axis is between this thermal sensing element and this air flow-producing device.
While having projecting direction ，Dang projector use according to projector of the present invention, casing is arranged on a workplace that is parallel to projecting direction, and thermal sensing element is positioned at above or below lampshade with respect to workplace.Further, power supply module comprises circuit board, and this circuit board has extension, stretches into this lampshade below, and this thermal sensing element is arranged on this extension.
According to projector of the present invention, power supply module comprises circuit board, and thermal sensing element is arranged on this circuit board.
According to projector of the present invention, also comprise system board, be electrically connected to this power supply module, this thermal sensing element is arranged on this system board.
By this, to utilize the thermal sensitivity of this thermal sensing element to protect this projector to avoid overheated in the present invention.In addition, this sensing module can be integrated in existing circuit board, and for example circuit board of power supply module or system board can further reduce costs and strengthen the fiduciary level of assembling product.
Accompanying drawing explanation
Fig. 1 is according to the functional block diagram of the projector of a preferred embodiment of the present invention.
Fig. 2 is the structure configuration schematic diagram of the projector of Fig. 1.
The vertical view of Tu3Wei Tu2Zhong projector.
The rear view of Tu4Wei Tu2Zhong projector.
Fig. 5 is the circuit diagram of partial circuit integration sensing module of power supply module of the projector of Fig. 1.
The thermal sensing element of Tu6Wei Tu2Zhong projector in the plane of vertical center axis with respect to the schematic diagram that arranges of lampshade.
The thermal sensing element of Tu7Wei Tu2Zhong projector in the plane of parallel central shaft with respect to the schematic diagram that arranges of lampshade.
Embodiment
For making that object of the present invention, structure, feature and function thereof are had to further understanding, hereby coordinate embodiment to be described in detail as follows.
Refer to Fig. 1 to Fig. 4, Fig. 1 is according to the rear view of the vertical view ，Tu4Wei projector 1 of the structure configuration schematic diagram ，Tu3Wei projector 1 of the functional block diagram ，Tu2Wei projector 1 of the projector 1 of a preferred embodiment of the present invention.Projector 1 comprises casing 10 (representing with the dashed-line outer box in Fig. 2 to Fig. 4) and is arranged at light source module 12 (with the empty wire frame representation in Fig. 3), light engine 14, power supply module 16, sensing module 18, system board 20 and the air flow-producing device 22 in casing 10.System board 20 is electrically connected to light engine 14 and power supply module 16.The projection lens 142 of light engine 14 is exposed to casing 10 and projects image to screen with a projecting direction 142a.Light source module 12 arranges to provide light engine 14 required light source adjacent to light engine 14.Light source module 12 is electrically connected to power supply module 16 and comprises illuminating part 122 and around the lampshade 124 of illuminating part 122, lampshade 124 has opening 124a, lampshade 124 definition one central shaft 124b (being shown in Fig. 3 with center line), the light of illuminating part 122 transmittings is roughly parallel to central shaft 124b and goes forward side by side in light engine 14 via opening 124a ejaculation lampshade 124.Sensing module 18 comprises thermal sensing element 182, and the contiguous lampshade 124 of thermal sensing element 182 arranges.Air flow-producing device 22 is roughly arranged at the corner in casing 10 and can produces the air-flow in this casing of flowing through, in order to each electronic component of dissipation projector 1, and the heat that especially light source module 12 produces.Power supply module 16 optionally stops to 12 power supplies of light source module, for example, keep power supply or cut off power supply, and then it being overheated to reach protection projector 1 according to the electric parameter of thermal sensing element 182.
Furthermore, due to 182 pairs of temperature tool susceptibilitys of thermal sensing element, therefore when light source module 12 produce the heat of too much heat or generation cannot dissipation or dissipation not in time, the electric parameter of thermal sensing element 182 changes, and power supply module 16 optionally stops light source module 12 according to this change.In the present embodiment, air flow-producing device 22 is fan, for example, in order to casing 10 internal flows (air) are discharged outside casing 10.Casing 10 has air outlet 102 (being shown in Fig. 3 with dotted line frame table) and at least one air intake vent 104a, 104b (its arrange scope with empty wire frame table in Fig. 3), and the corresponding air outlet 102 of air flow-producing device 22 is arranged in casing 10.Casing 10 extraneous airs enter casing 10 inside via air intake vent 104a, 104b, and casing 10 inner airs pass through air flow-producing device 22 to discharge via air outlet 102.Wherein, the flow path 202 (representing with the heavy line arrow in Fig. 3) of the air-flow that air flow-producing device 22 produces, thermal sensing element 182 is positioned at the flow path 202 of air-flow on one of them, for example make, for example, when air flow-producing device 22 task performances reduce (cause heat dissipation too late) or lost efficacy (cause heat cannot dissipation), the fast fast reaction of thermal sensing element 182 energy, and then power supply module 16 can be stopped in time to 12 power supplies of light source module, protection light source module 12 (especially illuminating part 122); But the present invention is not as limit.In the present embodiment, lampshade 124 relative luminous part 122 structural symmetry, aforementioned central shaft 124b may be defined as the optical axis of light source die group 12, and it is between thermal sensing element 182 and air flow-producing device 22.In addition, in practical application, thermal sensing element 182 can be thermistor, the thermistor of negative temperature coefficient or positive temperature coefficient (PTC) for example, and the electric parameter of 16 bases of power supply module is the electricity of thermal sensing element 182 and leads; But the present invention is not as limit.
In addition, in the present embodiment, power supply module 16 comprises circuit board 162, and thermal sensing element 182 is directly arranged on circuit board 162, therefore when power supply module 16 is installed, thermal sensing element 182 has also arranged in the lump.In the present embodiment, circuit board 162 has extension 162a, stretches into lampshade 124 belows, and it is upper that thermal sensing element 182 is arranged at extension 162a, and this contributes to thermal sensing element 182 to approach lampshade 124 settings, promotes the temperature-sensitive sensitivity of 182 pairs of light source modules 12 of thermal sensing element.In addition, in practical application, sensing module 18 can directly be integrated in power supply module 16 further, and its embodiment can be as shown in Figure 5, and it is the circuit diagram of the partial circuit integration sensing module 18 of power supply module 16.Wherein, the bleeder circuit that element R791, R792 form is connected to the negative input end (pin 2) of comparer IC791A, as with reference to voltage; Elements T R791 is negative tempperature coefficient thermistor (being thermal sensing element 182), and itself and element R793 form another bleeder circuit, is connected to the positive input terminal (pin 3) of comparer IC791A, as detecting voltage.Under normal condition, PFC(power factor correction, power factor correction) end is noble potential, now the resistance of elements T R791 is much larger than the resistance of element R792, therefore the output terminal of comparer IC791A (pin 1) is also noble potential, transistor Q701 maintains unlatching, and pfc circuit maintains regular event.When unusual condition occurs, for example temperature continue to rise, and the resistance of elements T R791 is continuous decrease, and during to resistance lower than element R792, the voltage of the positive input terminal of comparer IC791A (pin 3) is lower than the voltage of negative input end (pin 2).Now, the output terminal of comparer IC791A (pin 1) becomes electronegative potential, and transistor Q701 is closed, and pfc circuit stops action, and power supply module 16 does not resupply light source die group 12 electric power, and then reaches overheat protector effect.
Refer to Fig. 2, Fig. 3, Fig. 6 and Fig. 7, Fig. 6 is thermal sensing element 182 schematic diagram that arranges with respect to lampshade 124 in the plane of vertical center axis 124b, and Fig. 7 is thermal sensing element 182 schematic diagram that arranges with respect to lampshade 124 in the plane of parallel central shaft 124b.In practical application, via the sensing of lampshade 124 temperature, to reach, protect the mode of light source module 12 directly thermal sensing element 182 is attached to lampshade, not to be limited.In principle, space temperature and lampshade 124 temperature near lampshade 124 also have relativeness, therefore the invention is not restricted to the situation that thermal sensing element 182 is directly attached at lampshade 124.In the present embodiment, thermal sensing element 182 can, via experiment, be obtained the scope that arranges that thermal sensing element 182 can preferably reflect lampshade 124 temperature with respect to the setting position of lampshade 124.As shown in Figure 6, the projected outline of lampshade 124 in the plane of vertical center axis 124b (indicating its projected position with cross mark) is (for ease of explanation, in figure, directly the rear view with lampshade 124 represents) there is a D outer diameter, the distance H of thermal sensing element 182 (being illustrated in figure with dotted line frame) between the projection Yu Gai of this plane projected outline is between the D outer diameter of 0～1 times.In addition ，Gai projected outline is symmetrical with respect to an axis of symmetry 124c, and thermal sensing element 182 is the D outer diameter between 0～2 times in the projection of this plane and the distance X between axis of symmetry 124c.
Similarly, as shown in Figure 7, the projected outline of lampshade 124 in the plane of parallel central shaft 124b is (for ease of explanation, in figure, directly the top plan view with lampshade 124 represents, Fig. 6 center line X-X can be consulted in tangent plane position) there is a length L, the corresponding opening 124a of this projected outline has a reference edge 124d, perpendicular to central shaft 124b.From reference edge 124d along in contrast to opening 124a towards the distance Y of direction (be light penetrate direction) to thermal sensing element 182 (being illustrated in figure with dotted line frame) in the projection of this plane between the length L of 0～1.5 times.
Please later consult Fig. 4.In the present embodiment, when projector 1 is used, casing 10 is arranged on the workplace P1 (being shown in figure with chain line) that is roughly parallel to projecting direction 142a, and thermal sensing element 182 is positioned at lampshade 124 tops (for example, when projector is hung on ceiling) or below (for example, when projector is positioned over desktop) with respect to workplace P1.In practical application, can pass through the design of extension 162a, make thermal sensing element 182 can be arranged at lampshade 124 directly over or under.In addition, in the present embodiment, thermal sensing element 182 is directly arranged on the circuit board 162 of power supply module 16, but the present invention is not as limit.In practical application, thermal sensing element 182 also can be arranged at (as the electric connection being represented by dotted lines in Fig. 1) on system board 20, because system board 20 and power supply module 16 have electric connection, therefore when the electric parameter of thermal sensing element 182 changes, power supply module 16 also can be by system board 20 reactions optionally to stop light source module 12.Now ，Yu projector 1 is positioned under the use situation of desktop, and thermal sensing element 182 is arranged at lampshade 124 tops.What remark additionally is, in practical application, thermal sensing element 182 may have because the circuit board 162 of power supply module 16 or the setting position of system board 20 are different the different orientation that arrange with respect to lampshade 124, this conventionally knows that the knowledgeable can understand based on exposure of the present invention and implements according to this for the art tool, therefore not separately explanation one by one.
The present invention is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present invention.Must be pointed out that, the embodiment having disclosed does not limit the scope of the invention.On the contrary, the change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.
Claims (10)
1.Yi Zhong projector, is characterized in that comprising:
Casing;
Light source module, is arranged in this casing, and this light source module comprises illuminating part and around the lampshade of this illuminating part;
Air flow-producing device, in order to produce the air-flow in this casing of flowing through, so that this light source module is dispelled the heat;
Sensing module, is arranged in this casing, and this sensing module comprises thermal sensing element, and contiguous this lampshade setting of this thermal sensing element and this thermal sensing element are positioned on the flow path of this air-flow; And
Power supply module, is arranged in this casing, and this power supply module is electrically connected to this light source module and this sensing module, and this power supply module optionally stops this light source module power supply according to the electric parameter of this thermal sensing element.
2. projector as claimed in claim 1, is characterized in that this thermal sensing element is thermistor.
3. projector as claimed in claim 1, it is characterized in that this lampshade has a central shaft, the light ray parallel of this illuminating part transmitting penetrates this lampshade in this central shaft, this lampshade has a projected outline in the plane of vertical this central shaft, this projected outline has an external diameter, and the distance of this thermal sensing element between the projection Yu Gai of this plane projected outline is between this external diameter of 0 to 1 times.
4. projector as claimed in claim 3, is characterized in that this projected outline is with respect to a symmetrical rotational symmetry, and this thermal sensing element is this external diameter between 0 to 2 times in the projection of this plane and the distance between this axis of symmetry.
5. projector as claimed in claim 1, it is characterized in that this lampshade has a central shaft, the light ray parallel of this illuminating part transmitting penetrates this lampshade in this central shaft via the opening of this lampshade, this lampshade has a projected outline in the plane of parallel this central shaft, this projected outline is along having a length in the direction of parallel this central shaft, this projected outline be to having a reference edge by opening, certainly this reference edge along in contrast to this opening towards the distance of the projection of direction to this thermal sensing element in this plane between this length of 0 to 1.5 times.
6. projector as claimed in claim 1, is characterized in that this light source module has an optical axis, and this optical axis is between this thermal sensing element and this air flow-producing device.
7. projector as claimed in claim 1, it is characterized in that this projector has a projecting direction, when Dang Gai projector is used, this casing is arranged on a workplace that is parallel to this projecting direction, and this thermal sensing element is positioned at above or below this lampshade with respect to this workplace.
8. projector as claimed in claim 7, is characterized in that this power supply module comprises circuit board, and this circuit board has extension, stretches into this lampshade below, and this thermal sensing element is arranged on this extension.
9. projector as claimed in claim 1, is characterized in that this power supply module comprises circuit board, and this thermal sensing element is arranged on this circuit board.
10. projector as claimed in claim 1, is characterized in that this projector also comprises system board, is electrically connected to this power supply module, and this thermal sensing element is arranged on this system board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310429364.7A CN103529625B (en) | 2013-09-18 | 2013-09-18 | Projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310429364.7A CN103529625B (en) | 2013-09-18 | 2013-09-18 | Projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103529625A true CN103529625A (en) | 2014-01-22 |
| CN103529625B CN103529625B (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310429364.7A Active CN103529625B (en) | 2013-09-18 | 2013-09-18 | Projector |
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| Country | Link |
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| CN (1) | CN103529625B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001356417A (en) * | 2000-06-12 | 2001-12-26 | Canon Inc | Electronic apparatus and electronic apparatus module |
| KR20020001364A (en) * | 2000-06-28 | 2002-01-09 | 윤종용 | A super-heating protection circuit in a projector |
| JP2003035932A (en) * | 2001-07-23 | 2003-02-07 | Nec Viewtechnology Ltd | Lamp drive unit of projector and its driving method |
| JP2006301228A (en) * | 2005-04-20 | 2006-11-02 | Funai Electric Co Ltd | Projector |
| CN101435977A (en) * | 2007-11-12 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | Projector and overheating protection method thereof |
| JP2011154206A (en) * | 2010-01-27 | 2011-08-11 | Casio Computer Co Ltd | Light source device, projector, and projection method |
-
2013
- 2013-09-18 CN CN201310429364.7A patent/CN103529625B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001356417A (en) * | 2000-06-12 | 2001-12-26 | Canon Inc | Electronic apparatus and electronic apparatus module |
| KR20020001364A (en) * | 2000-06-28 | 2002-01-09 | 윤종용 | A super-heating protection circuit in a projector |
| JP2003035932A (en) * | 2001-07-23 | 2003-02-07 | Nec Viewtechnology Ltd | Lamp drive unit of projector and its driving method |
| JP2006301228A (en) * | 2005-04-20 | 2006-11-02 | Funai Electric Co Ltd | Projector |
| CN101435977A (en) * | 2007-11-12 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | Projector and overheating protection method thereof |
| JP2011154206A (en) * | 2010-01-27 | 2011-08-11 | Casio Computer Co Ltd | Light source device, projector, and projection method |
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| Publication number | Publication date |
|---|---|
| CN103529625B (en) | 2015-07-08 |
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