JP2006293086A - Light source unit and projection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source unit whose brightness can be adjusted arbitrarily under a more stable condition, and to provide a projection device. <P>SOLUTION: The light source unit is equipped with a light source part having a light source lamp 28; an integrator rod 31 averaging the luminance distribution of light from the light source part; a condensing lens 29 arranged in between the light source lamp 28 and the rod 31 and making the emitted light from the light source lamp 28 incident on the rod 31; and a light source driving part 34 for moving the condensing lens 29 along the optical axis and making the light condensing conditions changed, when the emitted light from the light source lamp 28 is made incident on the rod 31. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light source unit suitable for a projector device, for example, and a projection device using the light source unit.

2. Description of the Related Art Conventionally, in a projector light source device, a reflector is used for the purpose of improving the utilization factor of light radiated outward out of direct light not reflected by a reflector and eliminating a luminance gradient at the center and the peripheral portion of an image. A technology has been conceived in which a donut-shaped lens is provided between the lamp and the irradiated object, and direct light from the lamp bulb is condensed on the periphery of the irradiated object by a ring-shaped convex lens constituting the donut-shaped lens. Yes. (For example, Patent Document 1)
Japanese Patent Application Laid-Open No. 06-054101

  The technology described in the above-mentioned patent document uses direct light that is emitted from the lamp bulb of the light source and is directly emitted to the outside without being reflected by the reflector. That is, the shape design of the reflector with respect to the lamp bulb of the light source is considered to be effective in using the light emitted from the light source that has been wasted until then, and to eliminate the luminance difference between the center and the periphery of the irradiated object. It is a thing.

  Therefore, if it is possible to realize a reflector having a shape suitable for the lamp bulb, specifically reflecting all but direct light provided directly from the light source lamp to the projection optical path, and providing the projection optical path with uniform brightness, the above-mentioned patent Techniques described in the literature will not be necessary.

  By the way, projectors using light source lamps that emit light with extremely high brightness such as high-pressure mercury lamps are becoming popular recently. Contrary to the technology of the above-mentioned patent document, brightness adjustment and black floating of the screen (originally black) There are products that adjust the light amount of the lamp with an applied voltage or use a diaphragm mechanism in the projection optical path in order to prevent the portion to be displayed from appearing whitish (more precisely, dark gray).

  In this case, in order to adjust the applied voltage of the lamp, the applied voltage of the lamp is several tens [V], which is higher than that of other circuit units, and the circuit and processing become complicated. End up.

  In addition, a device using a diaphragm mechanism requires a space for disposing the diaphragm mechanism in the optical path, and the projection optical path becomes longer by that amount, which hinders downsizing of the entire projector apparatus.

  Further, in the case of a light source lamp driven by an AC power source, light emission is obtained each time while the polarity is reversed, and the bright spot position in the lamp moves, causing flickering of the projected image and a decrease in brightness. There was a problem that.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a light source unit and a projection apparatus capable of arbitrarily adjusting brightness in a more stable state.

  According to a first aspect of the present invention, a light source section having a light source lamp, an averaging means for averaging the luminance distribution of light from the light source section, and disposed between the light source lamp and the averaging means, the light source A dimming unit that causes the emitted light of the lamp to enter the averaging unit, and a driving unit that drives the dimming unit to change a light collecting state when the emitted light of the light source lamp enters the averaging unit; It is characterized by comprising.

  According to a second aspect of the present invention, in the first aspect of the invention, the dimming means is a lens for condensing and emitting the light emitted from the light source lamp to the averaging means, and the driving means is the The lens is moved along the optical axis between the light source lamp and the averaging means.

  According to a third aspect of the present invention, in the first aspect of the invention, the dimming means is a rotating disk in which a plurality of parallel transparent plates having different thicknesses are integrally formed on the rotating circumference, and the driving means is provided. Is characterized in that the rotating disk is rotationally driven to selectively insert a plurality of parallel transparent plates having different thicknesses into the optical path between the light source lamp and the averaging means.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the light source lamp of the light source unit is driven to be lit by an AC power source, and the driving means is synchronized with the AC power source. The condensing state when the light emitted from the lamp enters the averaging means is changed.

  The invention according to claim 5 is the invention according to claim 3, wherein the rotating disk has two or more equal numbers of parallel transparent plates each having a different thickness arranged on the rotating circumference according to a predetermined rule. It is characterized by.

  The invention described in claim 6 is the invention described in claim 3, wherein the rotating disk functions as a color wheel by attaching color filters having different color components for each of the plurality of parallel transparent plates.

A light source unit including a light source lamp, an averaging unit that averages a luminance distribution of light from the light source unit, and disposed between the light source lamp and the averaging unit. Dimming means for causing the emitted light to enter the averaging means, and driving means for driving the dimming means to change the light collection state when the emitted light of the light source lamp is incident on the averaging means. A light source unit; a light image forming unit that forms a light image using light emitted from the averaging unit of the light source unit; and a projecting unit that projects a light image formed by the light image forming unit. It is characterized by that.

  According to the first aspect of the present invention, the brightness of the incident light on the optical member constituting the averaging means is appropriately changed, so that the brightness can be increased as necessary without changing the driving voltage of the light source lamp. Since the light source lamp can be driven at a constant voltage without complicating the circuit, the life can be extended.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, it can be realized with a very simple configuration, and the optical path can be shortened to reduce the size of the entire apparatus.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1, it is possible to speed up the switching of the light collecting state by the light control means.

  According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, the movement of the bright spot position in the light source lamp by the AC power source is dealt with, and flickering is eliminated. The brightness of the light source can be stabilized.

  According to the fifth aspect of the invention, in addition to the effect of the third aspect of the invention, the rotational balance of the rotating disk can be balanced to cope with further speeding up of switching of the light collecting state.

  According to the invention described in claim 6, in addition to the effect of the invention described in claim 3, a color light image is formed in combination with a micromirror element or a liquid crystal display panel that forms a monochrome light image. Can do.

  According to the seventh aspect of the present invention, the brightness of the light source lamp is appropriately changed without changing the driving voltage of the light source lamp or the like by appropriately changing the condensing state of the incident light to the optical member constituting the averaging means. Since the light source lamp can be driven at a constant voltage without complicating the circuit, the life can be extended.

(First embodiment)
A first embodiment when the present invention is applied to a projector apparatus will be described below with reference to the drawings.

  FIG. 1 shows an external configuration of a projector apparatus 10 according to the embodiment. FIG. 1 (A) is mainly arranged on the front and top surfaces of the housing, and FIG. 1 (B) is arranged on the back and bottom surfaces of the housing. Indicates.

  As shown in FIG. 1A, a projection lens 12, a distance measuring sensor 13, and an Ir light receiving unit 14 are disposed on the front surface of a rectangular parallelepiped main body casing 11.

  The projection lens 12 is for projecting a light image formed by a spatial light modulation element such as a micromirror element, which will be described later, onto an object such as a screen, and here, a focus position and a zoom position (projection angle of view). Is arbitrarily variable.

  The distance measuring sensor 13 is arranged in a direction orthogonal to each other so that one of the two pairs of phase difference sensors is in the horizontal direction and the other is in the vertical direction. The distance to the light / dark pattern is measured along a one-dimensional detection line.

  The Ir light receiving unit 14 receives an infrared light (Ir) signal on which a key operation signal from a remote controller of the projector device 10 (not shown) is superimposed.

A switch unit 15 and a speaker 16 are disposed on the upper surface of the main body casing 11.
The switch unit 15 includes, for example, a power key, AF / AK (Automatic Focus / Automatic Keystone correction) key, zoom up / down key, brightness up / down key, signal selection key, volume up / down It consists of keys and cursor keys.

  The speaker 16 emits a sound of the input audio signal and a beep sound during operation.

Further, as shown in FIG. 1B, an input / output connector portion 17, an Ir light receiving portion 18, and an AC adapter connecting portion 19 are disposed on the back surface of the main body casing 11.
The input / output connector unit 17 includes, for example, a USB terminal for connection with an external device such as a personal computer, a mini D-SUB terminal for video input, an S terminal, an RCA terminal, a stereo mini terminal for audio input, and the like. Become.

Similar to the Ir light receiver 14, the Ir light receiver 18 receives an infrared light (Ir) signal on which a key operation signal from a remote controller (not shown) is superimposed.
The AC adapter connection unit 19 connects an AC cable from an AC adapter (not shown) serving as a power source.

  Further, adjustment legs 20 a to 20 d capable of height adjustment are attached to the lower surface of the main body casing 11 at the four corners.

Next, the functional configuration of the electronic circuit of the projector apparatus 10 will be described with reference to FIG.
In the figure, different video signals of various television standard systems inputted from the input / output connector unit 17 are output from the projector device 10 by the video conversion unit 22 via the input / output interface (I / F) 21 and the system bus SB. After being unified into a video signal of a predetermined format suitable for projection, it is sent to the display encoder 23.

  The display encoder 23 develops and stores the transmitted video signal in the video RAM 24, generates a video signal from the stored contents of the video RAM 24, and outputs the video signal to the projection driving unit 25.

  This projection drive unit 25 is a high-speed time-division drive according to a frame rate, for example, 60 [frames / second] and the number of display gradations corresponding to the transmitted video signal, for example, a micromirror element. The spatial light modulator (SOM) 26 to be displayed is driven.

  For example, high-intensity white light emitted from a light source lamp 28 such as an ultra-high pressure mercury lamp disposed in a reflector 27 is condensed on the spatial light modulation element 26 by a condenser lens 29 and then passed through a color wheel 30. By appropriately illuminating the primary color and averaging the luminance distribution with the integrator rod 31 and irradiating it through the mirror 32, a light image is formed by the reflected light, and a screen (not shown) through the projection lens 12 is formed here. Is projected and displayed.

  The control unit 33 controls all the operations of the above circuits. The control unit 33 includes a CPU, a non-volatile memory that stores an operation program executed by the CPU including a standard television discrimination process described later, a work memory, and the like.

  The control unit 33 is also connected to the Ir light receiving units 14 and 18, the light source driving unit 34, the distance measurement processing unit 35, and the audio processing unit 36 via the system bus SB.

  The light source driving unit 34 drives the light source lamp 28 to emit light, controls the position of the condensing lens 29, and controls the driving of the motor (M) 37 that rotates the color wheel 30, while entering the integrator rod 31. The detection signals from the pair of light receiving sensors 38a and 38b attached to the outside of the opening are received, digitized, and sent to the control unit 33.

  The distance measurement processing unit 35 drives the distance measurement sensor 13 to measure the vertical and horizontal distances to the projection target.

The sound processing unit 36 includes a sound source circuit such as a PCM sound source, converts the given sound data into an analog during the projection display operation, and drives the speaker 16 to emit loud sounds.
Each key operation signal in the switch unit 15 is directly input to the control unit 33. Infrared light reception signals from the Ir light receiving unit 14 and the Ir light receiving unit 18 provided on the back side of the main body casing 11 are also used. Input to the control unit 33.

Next, the operation of the above embodiment will be described.
FIG. 3 shows the processing contents executed by the control unit 33 in response to the operation of the brightness up / down key of the switch unit 15 when the power is turned on. Initially, any of these key operations is performed by repeatedly determining whether or not the luminance up key has been operated (step S01) and whether or not the luminance down key has been operated (step S02). Wait.

  If it is determined in step S01 that the brightness up key has been operated, it is confirmed that the condensing lens 29 is not in the foremost position near the light source lamp 28 in the movable range by the light source driving unit 34 at that time. (Step S03), the light source driving unit 34 moves the condenser lens 29 so as to approach the light source lamp 28 by one step (Step S04), and then returns to the processing from Step S01 again.

  FIG. 4A illustrates the arrangement of the integrator rod 31 provided with the reflector 27, the light source lamp 28, the condensing lens 29, and the light receiving sensors 38a and 38b. The condensing lens 29 is movable here. The state in the forefront position in the range is shown.

  In the state where the condenser lens 29 is at the foremost position as shown in FIG. 5A, all the direct light from the light source lamp 28 and the reflected light from the reflector 27 are condensed by the condenser lens 29 and all the integrator rod 31. The case where the light is incident into the incident aperture and utilized as projection light is shown.

  In this case, the pair of light receiving sensors 38a and 38b attached to the outside of the entrance aperture of the integrator rod 31 is not irradiated with projection light from the light source lamp 28 and the reflector 27 at all, and the detection output thereof is “0 (zero)” level. Become.

  If it is determined in step S03 that the condensing lens 29 is already in the forefront position near the light source lamp 28 in the movable range of the light source driving unit 34, the condensing lens 29 is further closer to the light source lamp 28. Since it cannot be moved, the operation of the brightness up key is set to NOP (No Operation: Invalid), and the process in step S04 is not performed, and the process returns to step S01 as it is.

  On the other hand, if it is determined in step S02 that the brightness down key has been operated, the condensing lens 29 is not in the last position near the integrator rod 31 in the movable range of the light source driving unit 34 at that time. (Step S05), and after confirming that the outputs of the light receiving sensors 38a and 38b do not exceed a certain value (Step S06), the light source driving unit 34 moves the condenser lens 29 by one stage to the integrator rod. It moves so that it may approach 31 (step S07), and returns to the process from said step S01 again after that.

  FIG. 4B shows a state where the condensing lens 29 is at the last position in the movable range. In the state where the condenser lens 29 is at the rearmost position as shown in FIG. 4B, the direct light from the light source lamp 28 and the reflected light from the reflector 27 are condensed by the condenser lens 29, and the integrator rod 31. The case where it is irradiated to a wide range including the incident aperture is shown.

  In this case, the pair of light receiving sensors 38a and 38b attached to the outside of the entrance opening of the integrator rod 31 is also irradiated with projection light from the light source lamp 28 and the reflector 27, and the integrator rod 31 increases as the output level of the detection signal increases. Therefore, the amount of light deviating from the incident aperture is large.

  Accordingly, each time the brightness down key is operated, the condenser lens 29 is moved by a certain amount to the side where the integrator rod 31 is located, so that the amount of light irradiated into the entrance opening of the integrator rod 31 is reduced each time. As a result, the brightness of the projection light emitted from the projection lens 12 toward the projection target decreases as the brightness down key is operated.

  If it is determined in step S05 that the condensing lens 29 is already in the rearmost position near the integrator rod 31 in the movable range of the light source driving unit 34, the condensing lens 29 is further moved closer to the integrator rod 31. Since the operation of the brightness down key is NOP (invalid), the process directly returns to the process from step S01.

  In step S06, it is assumed that the outputs of the light receiving sensors 38a and 38b have exceeded a certain value, and that the luminance adjustment (dimming) has already been sufficiently performed by the condenser lens 29. The operation is NOP (invalid), and the process returns to step S01.

  As described above, the brightness of the projection light is changed as necessary by appropriately changing the condensing state of the incident light to the integrator rod 31 that averages the luminance distribution of light from the light source lamp 28 and the reflector 27 that are light sources. Can be adjusted.

  The moving range of the condensing lens 29 driven by the light source driving unit 34 is actually limited to mechanical factors, and the moving range is also determined when determining the moving range of the condensing lens 29 in steps S03 and S05. Is fixed in advance by the mechanical factor, the user of the projector apparatus 10 can arbitrarily set a “constant value” that serves as a reference for the output level of the light receiving sensors 38a and 38b determined in step S06. If it can be set, at least the lower limit when the brightness of the projection light is lowered can be determined by the user himself.

  Further, in the above embodiment, the light receiving sensors 38a and 38b are provided outside the entrance opening of the integrator rod 31, but the light receiving sensors 38a and 38b are not provided, and the processing in step S06 may be omitted. However, since the movable range of the condenser lens 29 is determined, the brightness of the projection light can be adjusted similarly.

  In addition, when the light from the light source lamp 28 and the reflector 27 is incident on the integrator rod 31 via the color wheel 30, the light flux is narrowed by the condensing lens 29 that moves along the optical path. This can be realized, and the entire optical path can be reduced by shortening the optical path.

(Second Embodiment)
A second embodiment in which the present invention is applied to a projector apparatus will be described below with reference to the drawings.

  The external configuration of the projector apparatus 10 according to the present invention is basically the same as that shown in FIG. 1 and the functional configuration of the electronic circuit is basically the same as that shown in FIG. Illustration and description are omitted.

  In the present embodiment, it is assumed that the light source driving unit 34 drives the light source lamp 28 to be lit by an AC (alternating current) power source.

  Further, the light receiving sensors 38a and 38b corresponding to the incident opening position of the integrator rod 31 are not provided.

  In such a configuration, the light source lamp 28 is driven to be lit by the AC power source as described above. Therefore, each time the polarity of the driving voltage is reversed, the position of the bright spot due to arc discharge in the lamp moves.

  Accordingly, the light source driving unit 34 moves the position of the condenser lens 29 on the optical axis in synchronization with the movement of the bright spot position of the light source lamp 28, resulting in the incident aperture of the integrator rod 31 as a result. Stabilize the light condensing state.

  FIG. 5A shows a state where a bright spot LS is generated slightly on the opening side of the reflector 27 from the center position of the light source lamp 28. At this time, the light source driving unit 34 adjusts the light from the light source lamp 28 and the reflector 27 so as to be accommodated in the entrance opening of the integrator rod 31 by moving the condenser lens 29 to a position relatively away from the opening of the reflector 27. ing.

  On the other hand, FIG. 5B shows a state in which a bright spot LS is generated on the far side slightly away from the opening of the reflector 27 from the center position of the light source lamp 28. At this time, the light source driving unit 34 moves the condenser lens 29 to a position close to the opening of the reflector 27 so that the light from the light source lamp 28 and the reflector 27 is incident on the entrance opening of the integrator rod 31 as in FIG. It is adjusted so that it will fit.

  Since the position where the bright spot LS is generated can be roughly specified in advance by the shape of the light source lamp 28, the applied voltage, the AC frequency, and the like, the light source driving unit 34 collects light in synchronization with the lighting driving of the light source lamp 28. By moving the position of the lens 29 on the optical axis as shown in FIGS. 5 (A) and 5 (B), to the stable integrator rod 31 regardless of the movement of the bright spot LS by AC driving of the light source lamp 28. The incident light quantity can be maintained, and as a result, the projection light from the projection lens 12 can be stabilized with a uniform light quantity that does not cause flickering.

  As in the first embodiment, when adjusting the brightness of the projection light by the user's key operation, the movement amount of the condenser lens 29 shown in FIGS. 5A and 5B is maintained. This can be realized by shifting the movement position along the optical axis.

(Modification of the second embodiment)
In the second embodiment, the condenser lens 29 is disposed between the reflector 27 provided with the light source lamp 28 and the integrator rod 31, and the optical axis is synchronized with the movement of the bright spot LS of the light source lamp 28. However, depending on the driving frequency of the light source lamp 28, such movement control may be very difficult. Therefore, an optical member that can be switched at a higher speed is required.

  FIG. 6 illustrates the principle of the configuration according to the modification of the second embodiment of the present invention.

  Here, in place of the condenser lens 29, a rotating disk 42 that is driven to rotate by a motor 41 is provided. The rotating disk 42 is formed by integrally forming a plurality of parallel transparent plates 42 a and 42 b having different thicknesses on the rotating circumference, and these are selectively driven by the rotation of the motor 41, and the light source lamp 28 and the reflector 27. To be inserted into the optical axis.

  FIG. 6A shows a state where a bright spot LS is generated on the far side slightly away from the opening of the reflector 27 from the center position of the light source lamp 28. At this time, it is assumed that the parallel transparent plate 42a having the thinner rotating disk 42 is inserted into the optical axis. The light from the light source lamp 28 and the reflector 27 is bent in the direction of the incident angle corresponding to the material of the parallel transparent plate 42a on the surface of the parallel transparent plate 42a, and then passes through the thin plate thickness of the parallel transparent plate 42a. Similarly to the above, the direction is bent again with the emission angle corresponding to the material of the parallel transparent plate 42a and reaches the integrator rod 31 side.

  On the other hand, FIG. 6B shows a state where a bright spot LS is generated slightly near the opening side of the reflector 27 from the center position of the light source lamp 28. At this time, the thicker parallel transparent plate 42b of the rotating disk 42 is inserted into the optical axis. The light from the light source lamp 28 and the reflector 27 is bent in the direction of the incident angle corresponding to the material of the parallel transparent plate 42b on the surface of the parallel transparent plate 42b, and then passes through the thick plate thickness of the parallel transparent plate 42b. Similarly to the above, the direction is bent again with the emission angle corresponding to the material of the parallel transparent plate 42b and reaches the integrator rod 31 side.

  The path of the light from the light source when the parallel transparent plate 42a or 42b does not exist is indicated by a broken line in FIGS. 6A and 6B, as compared with the parallel transparent plate 42a. On the other hand, since the distance traveled in the parallel transparent plate after being deflected by the incident angle is larger by the thicker plate thickness, the position where the light from the light source lamp 28 and the reflector 27 converges is made larger downstream in the optical path. Will shift.

  It is considered that the position where the bright spot LS is generated can be roughly specified in advance by the shape of the light source lamp 28, the applied voltage, the AC frequency, and the like, and the rotating disk having parallel transparent plates 42a and 42b of the material and thickness corresponding to it. 42, the light source driving unit 34 controls the position of the timing when the parallel transparent plates 42 a and 42 b of the rotating disk 42 are inserted on the optical axis in synchronization with the lighting driving of the light source lamp 28 by the motor 41. Maintaining a stable amount of incident light on the integrator rod 31 despite the movement of the bright spot LS due to AC driving of the light source lamp 28, and as a result, stabilizing the projection light from the projection lens 12 with a uniform amount of light. Can do.

  In the actual rotating disk 42, if the parallel transparent plates 42a and 42b as shown in FIG. 6 are arranged so that each one has a central angle of 180 °, the center of gravity of the rotating disk 42 is obtained. The position moves to the side of the parallel transparent plate 42b where the plate thickness is large, and the rotation balance is easily lost by high-speed rotation, and the entire rotating disk 42 vibrates, or the rotating shaft of the motor 41 is bent, and the rotating disk 42 is damaged. May end up.

  Therefore, considering that the rotating disk 42 is a rotating body that rotates at a high speed, the parallel transparent plates 42a and 42b are arranged in the same number in two or more locations evenly distributed on the circumference, thereby rotating at a high speed. It becomes possible to balance the rotation of the hour.

  FIG. 7 exemplifies the configuration of the rotating disk 42 and the motor 41 when the parallel transparent plates 42a and 42b are divided into three parts, and the circumference is divided into six parts (each central angle 60 °). It can be easily understood that the shape does not disturb the rotation balance.

  In addition, here, by dividing the circumference into six parts, the color wheel 30 can be adhered to the flat surface side of the rotating disk 42, and can be provided integrally. For example, if R (red), G (green), B (blue), R, G, and B color filters are sequentially arranged in each divided area, one of the two parts is always provided for each identical color component. Since the parallel transparent plate 42a is thin and the parallel parallel plate 42b is thick on the other side, it is possible to cope with the entire color balance without breaking.

  Therefore, it becomes possible to form a color light image by combining with the spatial light modulation element 26 such as the above-described micromirror element that forms a monochrome light image, or a transmission-type monochrome liquid crystal display panel. This can contribute to further downsizing of the entire apparatus.

  In the first and second embodiments described above, the present invention is applied to the projector device and the amount of light incident on the integrator rod 31 that averages the luminance distribution of the projection light is adjusted. Means for averaging the luminance distribution is not limited to the integrator rod, and other members called light tunnels may be used.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, at least one of the problems described in the column of the problem to be solved by the invention can be solved, and described in the column of the effect of the invention. In a case where at least one of the obtained effects can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.

1 is a perspective view showing an external configuration of a projector apparatus according to a first embodiment of the present invention. 2 is a block diagram showing a functional configuration of the electronic circuit according to the embodiment. FIG. The flowchart which shows the processing content corresponding to operation of the brightness adjustment key which concerns on the embodiment. The figure which illustrates the incident state to the integrator rod according to the movement position of the condensing lens of the light source part which concerns on the embodiment. The figure which illustrates the incident state to the integrator rod according to the movement position of the condensing lens of the light source part which concerns on the 2nd Embodiment of this invention. The figure which illustrates the incident state to the integrator rod according to the movement position of the condensing lens of the light source part which concerns on the modification of the embodiment. The perspective view which illustrates the specific structure of the motor and rotary disk which concern on the modification of the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Projector apparatus, 11 ... Main body casing, 12 ... Projection lens, 13 ... Distance measuring sensor, 14 ... Ir light-receiving part, 15 ... Switch part, 16 ... Speaker, 17 ... Input / output connector part, 18 ... Ir light-receiving part, 19 DESCRIPTION OF SYMBOLS ... AC adapter connection part, 20a-20d ... Adjustment leg part, 21 ... Input / output interface (I / F), 22 ... Video | video conversion part, 23 ... Display encoder, 24 ... Video RAM, 25 ... Projection drive part, 26 ... Space 27: reflector, 28 ... light source lamp, 29 ... condensing lens, 30 ... color wheel, 31 ... integrator rod, 32 ... mirror, 33 ... control unit, 34 ... light source driving unit, 35 ... ranging process Part, 36 ... voice processing part, 37 ... motor (M), 38a, 38b ... light receiving sensor, 41 ... motor, 42 ... rotating disk, 42a, 42b ... parallel transparent plate, LS ... Point, SB ... system bus.

Claims (7)

A light source unit having a light source lamp;
Averaging means for averaging the luminance distribution of light from the light source unit;
A dimming unit disposed between the light source lamp and the averaging unit, and causing the light emitted from the light source lamp to enter the averaging unit;
A light source unit comprising: drive means for driving the light control means to change a light collecting state when light emitted from the light source lamp is incident on the averaging means. The light control means is a lens for condensing the incident light from the light source lamp to the averaging means,
2. The light source unit according to claim 1, wherein the driving means moves the lens along an optical axis between the light source lamp and the averaging means. The dimming means is a rotating disk in which a plurality of parallel transparent plates having different thicknesses are integrally formed on the rotating circumference,
2. The driving means according to claim 1, wherein the rotating disk is rotationally driven to selectively insert the plurality of parallel transparent plates having different thicknesses into an optical path between the light source lamp and the averaging means. Light source unit. The light source lamp of the light source unit is lit and driven by an AC power source,
The said drive means changes the condensing state at the time of the emitted light of the said light source lamp injecting into the said averaging means synchronizing with the said alternating current power supply, The Claim 1 thru | or 3 characterized by the above-mentioned. Light source unit.   4. The light source unit according to claim 3, wherein the rotating disk is formed by arranging two or more equal numbers of parallel transparent plates having different thicknesses on the rotating circumference according to a predetermined rule.   4. The light source unit according to claim 3, wherein the rotating disk functions as a color wheel by attaching color filters having different color components to each of the plurality of parallel transparent plates. A light source section including a light source lamp, an averaging means for averaging the luminance distribution of light from the light source section, and disposed between the light source lamp and the averaging means, and the light emitted from the light source lamp is incident on the averaging means A light source unit having a light control unit, and a drive unit that drives the light control unit to change a light collecting state when light emitted from the light source lamp is incident on the averaging unit;
A light image forming means for forming a light image using light emitted from the averaging means of the light source unit;
A projection apparatus comprising: projection means for projecting a light image formed by the light image forming means.

Images