WO2020161846A1

WO2020161846A1 - Projection device

Info

Publication number: WO2020161846A1
Application number: PCT/JP2019/004348
Authority: WO
Inventors: 将利西村; 旭洋山田
Original assignee: 三菱電機株式会社
Priority date: 2019-02-07
Filing date: 2019-02-07
Publication date: 2020-08-13
Also published as: JPWO2020161846A1; JP7191130B2

Abstract

Provided is a projection device that can switch between a functional state of projecting illumination light and a functional state of projecting an image. A projection device (100) is provided with a light source (1), an optical unit (2), an image forming unit (3), and an optical unit (4). The light source (1) emits light (R1). The optical unit (2) receives the light (R1), and outputs light (R2) obtained by changing light distribution of the light (R1). The image forming unit (3) includes an image forming region (31) where the light (R2) is received, and changed into and outputted as image light (R31), and a peripheral region (32) where the light (R2) is received, and outputted as illumination light (R32). The optical unit (4) projects the image light (R31), and forms a projection image. The projection device (100) changes, by changing the light distribution, the ratio of the amount of light (R2) received in the image forming region (31) and the amount of light (R2) received in the peripheral region (32).

Description

Projector

The present invention relates to a projection device.

For example, Patent Document 1 proposes a traffic information system in which a light pattern is drawn on the road surface by projecting light on the road surface. In this traffic information system, a beam deflector scans a light beam forming a light spot. The scanning of the light beam causes the light spot to move in the projection area of the road surface. A pattern of light is displayed by the moving light spot.

Japanese Patent Publication No. 2006-525590 (eg, paragraphs 0014 to 0019, FIG. 1)

However, since the above traffic information system includes the beam deflector and its control circuit, there is a problem that the configuration becomes complicated.

The present invention has been made to solve the above problems, and provides a projection device that can switch between a state of a function of illuminating illumination light and a state of a function of projecting an image with a simple configuration. The purpose is to do.

A projection apparatus according to the present invention includes a light source section that emits first light, and a first optical section that emits second light whose divergence angle is changed based on the first light emitted by the light source section. An image forming area where an image is formed and the second light is an image light containing information of the image, and a peripheral area which is located on the peripheral side of the image forming area and uses the second light as illumination light. An image forming unit including the image forming unit and a second optical unit that projects the image light to form a projected image based on the image, and changes the divergence angle to change the amount of the image light and the amount of the illumination light. Change the ratio with.

According to the present invention, the projecting device can be switched to a state of a function of illuminating illumination light or a state of a function of projecting an image with a simple configuration.

It is a figure which shows schematically the main structures in the state of the illumination function of the projection apparatus which concerns on Embodiment 1 of this invention. FIG. 3 is a diagram schematically showing a main configuration in a projection function state of the projection device according to the first embodiment. FIG. 3 is a diagram showing a main configuration in a lighting function state of the projection apparatus according to the first embodiment and a main path of light passing through a first optical unit in a lighting function state. FIG. 3 is a diagram showing a main configuration in a projection function state of the projection apparatus according to the first embodiment and a main path of light passing through a first optical unit in the projection function state. 9A and 9B are a side view and a front view schematically showing the outer appearance of the first optical unit of the projection device according to the first embodiment. 6A and 6B are a side view and a front view schematically showing the outer appearance of the image forming unit of the projection device according to the first embodiment. FIG. 3 is a diagram showing a main path of light passing through a second optical unit of the projection device according to the first embodiment. 7A and 7B are a side view and a front view schematically showing the outer appearance of the second optical unit of the projection device according to the first embodiment. It is a figure which shows the main structures in the state of the illumination function of the projection apparatus which concerns on Embodiment 2 of this invention, and the main path|route of the light which passes a 1st optical part. FIG. 9 is a diagram showing a main configuration and a main path of light passing through a first optical unit in a projection function state of the projection device according to the second embodiment. It is a figure which shows the main structures in the state of the illumination function of the projection apparatus which concerns on Embodiment 3 of this invention, and the main path|route of the light which passes a 1st optical part. FIG. 13 is a diagram showing a main configuration and a main path of light passing through a first optical unit in a projection function state of the projection device according to the third embodiment. It is a figure which shows the main structures in the state of the illumination function of the projection apparatus which concerns on Embodiment 4 of this invention, and the main path|route of the light which passes a 1st optical part. FIG. 16 is a diagram showing a main configuration and a main path of light passing through a first optical unit in a projection function state of the projection device according to the fourth embodiment. It is a figure which shows the main structures in the state of the illumination function of the projection apparatus which concerns on Embodiment 5 of this invention, and the main path|route of the light which passes a 1st optical part. FIG. 16 is a diagram showing a main configuration and a main path of light passing through a first optical unit in a projection function state of the projection device according to the fifth embodiment. FIG. 8 is a diagram showing a schematic cross-sectional structure of a second optical section of a projection device according to the first modification of the first to fifth embodiments and a main path of light passing through the second optical section. FIG. 9 is a diagram showing a schematic cross-sectional structure of a second optical unit of a projection device according to Modification 2 of Embodiments 1 to 5 and a main path of light passing through the second optical unit. FIG. 9 is a diagram showing a schematic cross-sectional structure of a second optical unit of a projection device according to Modification 3 of Embodiments 1 to 5 and a main path of light passing through the second optical unit.

A projection device according to an embodiment of the present invention will be described below with reference to the drawings. The projection device according to the embodiment can switch between the state of the illumination function and the state of the projection function.

“The state of the illumination function” indicates that the projection device is in a state in which it can perform the illumination function or that the projection device is in the state of exhibiting the illumination function. The “state of the illumination function” indicates that the projection device is in a state in which it can emit the illumination light or that the projection device is in the state of emitting the illumination light. In the "state of illumination function", the projection device is configured as an illumination device. That is, in the "state of the illumination function", the respective constituent elements of the projection device are arranged in a state of exhibiting the function of the illumination device.

“The state of the projection function” indicates that the projection device is in a state where it can perform the projection function, or that the projection device is in the state where it is performing the projection function. The “projection function state” indicates that the projection device can project an image or that the projection device is projecting an image. In the “state of projection function”, the projection device is configured as a projection device. That is, in the “projection function state”, each component of the projection device is arranged in a state in which the function of the projection device is exerted.

Note that it is not necessary to turn on the light source in the “lighting function state” and the “projection function state”. In the "state of the illumination function" and the "state of the projection function", the light source may be turned off. That is, it suffices if each component of the projection device is arranged at a position where it can perform its function.

　In the state of the illumination function, the illumination light is applied to the target area. That is, in the state of the illumination function, the illumination light is applied to the illuminated area. In the state of the projection function, the image light including the image information is projected on the target area. The image light is light containing image information. That is, in the state of the projection function, the image light is projected onto the illuminated area. At this time, the image is projected on the target area. Therefore, the projection device according to the embodiment is a projection device with a lighting function. Alternatively, the projection device according to the embodiment is a lighting device with a projection function.

The target area to which the illumination light is applied is the same as the target area to which the image light is projected. Here, "the same target area" includes the case where the target area to which the illumination light is irradiated includes the target area to which the image light is projected. The “same target area” includes the case where the target area onto which the image light is projected includes the target area onto which the illumination light is applied.

The projection device according to the embodiment is, for example, a spotlight, a downlight, a ceiling light, or a vehicle lamp. A spotlight is a lighting device that illuminates one point in a concentrated manner. The downlight is a small lighting device that is mounted so as to be embedded in the ceiling. A ceiling lamp is a lighting device attached to the ceiling. The vehicle lighting device is, for example, a vehicle headlight device, a daylight, or a fog light. The daylight is a light that is turned on in the daytime to improve the visibility from the surroundings of a running vehicle. Fog lights are lights that illuminate the road surface when the field of view in front is limited due to heavy fog. In the projection device according to the embodiment, the size of the illumination range of the illumination light and the size of the projected image are not particularly limited.

The projection device according to the embodiment projects an image on the target area by projecting image light in the state of the projection function. In the present application, “image” includes characters, still images, and moving images. "Projection" is to project an image. The “target area” is the irradiated area. Areas of interest include floors, road surfaces, walls, and other areas on the surface of an object. The projected “image” is, for example, an arrow mark displayed on the road surface for guiding a pedestrian, a caution mark, a warning mark, or a display indicating a delay.

In the following, an XYZ Cartesian coordinate system will be used for ease of explanation. The Z axis is a coordinate axis parallel to the optical axis of the projection device. The +Z axis direction is the irradiation direction of light emitted from the projection device. The central ray of the light emitted from the projection device travels in the +Z axis direction. When the projection device is a headlight device mounted on a vehicle, the Z-axis direction is a direction inclined with respect to the road surface. That is, the Z-axis direction is not parallel to the road surface. For example, when the projection device is mounted in the front of the vehicle, the +Z axis direction is the front of the vehicle and the −Z axis direction is the rear of the vehicle. However, the projection device may be mounted behind the vehicle. In this case, the +Z axis direction is the rear side of the vehicle and the −Z axis direction is the front side of the vehicle.

The central ray can be, for example, a ray in the angular direction that is a weighted average of the light intensity distribution with respect to the emission angle of light. Also, the central ray can be, for example, a ray in the main direction in which most of the light travels. The ray on the principal optical axis can be the central ray. The principal optical axis is not the geometric center axis of the lighting device, but the optical center axis emitted by its light source. The principal optical axis is generally the direction of emission of highest intensity. Further, the axis that overlaps this central ray can be the optical axis of the projection device 100. Usually, since the central light intensity is highest with respect to the emission angle, the optical axis is an axis that passes through the center of the light emitting surface of the light source 1 and is perpendicular to the light emitting surface. Then, normally, the central ray is a ray on the optical axis.

The X axis is the coordinate axis in the direction orthogonal to the Z axis. When the projection device is a headlight device mounted on a vehicle, the X-axis direction is the left-right direction of the vehicle. That is, the X-axis direction is the width direction of the vehicle. When facing the front of the vehicle, the left direction is the +X axis direction and the right direction is the -X axis direction.

The Y axis is a coordinate axis in a direction orthogonal to the Z axis and the X axis. When the projection device is mounted on a vehicle, the Y-axis direction is the vertical direction of the vehicle. The upward direction of the vehicle is the +Y-axis direction, and the downward direction of the vehicle is the -Y-axis direction. That is, the direction of the sky is the +Y axis direction, and the direction of the road surface is the −Y axis direction.

In the following embodiments, the

optical parts

2 and 4 will be described as the shape of a rotating body centered on the optical axes C2 and C4. However, the

optical parts

2 and 4 can take shapes other than the shape of the rotating body. For the

optical units

2 and 4, for example, surfaces having different curvatures in two orthogonal axial directions can be adopted. A surface having two different axial curvatures that are orthogonal to each other is a toroidal surface. The toroidal surface includes a cylindrical surface. The cylindrical surface has a curvature in one direction (first direction) and does not have a curvature in a direction (second direction) perpendicular to the direction (first direction). For example, in the drawings shown on the YZ plane in the following embodiments, the

optical units

2 and 4 have no curvature in the X-axis direction.

Also, in the following embodiments, the

optical parts

2 and 4 have a symmetrical shape with respect to the optical axes C2 and C4. However, the shapes of the

optical parts

2 and 4 can be one side with respect to the optical axes C2 and C4. In this case, the outside of the

optical units

2 and 4 indicates a position far from the optical axes C2 and C4.

<<1>> Embodiment 1
<<1-1>> Configuration of Projector 100 FIG. 1 is a diagram schematically showing a main configuration of projector 100 according to the first embodiment in a state of an illumination function. FIG. 2 is a diagram schematically showing the main configuration of the projection apparatus 100 in the projection function state. 1 and 2 show a sectional structure in which a member of the optical system is cut along a plane parallel to the YZ plane. 1 and 2, constituent elements of the control system are shown by functional blocks.

The projection device 100 includes a light source unit 1, an optical unit 2, an image forming unit 3, and an optical unit 4. The projection device 100 can include a moving unit 5, a light source driving unit 81, a movement control unit 82, a display control unit 83, and a control unit 84.

<<1-2>> Light source unit 1
The light source unit 1 emits the light R1. The light source unit 1 emits the light R1 in the +Z-axis direction. The light source unit 1 emits the light R1 toward the optical unit 2. "Emitting" means emitting light in a certain direction. The optical axis of the light source unit 1 is indicated by C1. The light source unit 1 is, for example, a light source component.

The light emitting surface 11 of the light source unit 1 is a surface that emits light. The light emitting surface 11 is, for example, a light emitting surface. The light emitting surface 11 has, for example, a circular shape or a rectangular shape.

The light source unit 1 includes, for example, a solid-state light source or a lamp light source.

The solid-state light source is, for example, a semiconductor light source. The semiconductor light source is, for example, a light emitting diode (LED) or a laser diode (LD). The solid-state light source may be a light source using organic electroluminescence (organic EL). Alternatively, the solid-state light source may be a light source including a phosphor and an excitation light source that irradiates the phosphor with excitation light. The phosphor is applied in a planar shape, for example. When the light source unit 1 includes a solid-state light source, the luminous efficiency and directivity can be increased as compared with the case where the light source unit includes a lamp light source. In addition, when the light source unit 1 includes a solid-state light source, the weight and power consumption of the projection device 100 can be reduced.

The lamp light source is, for example, an incandescent lamp, a halogen lamp or a fluorescent lamp. The lamp light source may include a reflector. The reflector is, for example, a reflecting mirror. The reflector reflects the light emitted from the light emitter. The luminous body is a part that emits light. By providing the reflector, the light emitted from the light emitter can have directivity.

▽ "Directivity" is a property in which the intensity of the output light varies depending on the direction when the light is output from the light source section into the space. “Having directivity” means that, for example, light travels in front of the light emitting surface and does not travel behind the light emitting surface. That is, the divergence angle of the light emitted from the light source section having directivity is 180 degrees or less. The light source unit 1 shown in the following embodiments is, for example, a light source unit having directivity.

<<1-3>> Optical unit 2
The optical unit 2 changes the distribution of incident light. The optical unit 2 changes the divergence angle of incident light. The optical unit 2 can collect the light R1 emitted from the light source unit 1. The optical unit 2 can focus light on the optical axis C2, for example. "Condensing" means collecting light. That is, the divergence angle of the emitted light is smaller than the divergence angle of the incident light. The “light distribution” is a luminous intensity distribution with respect to the space of the light source. That is, the light distribution is the spatial distribution of the light emitted from the light source. The light distribution indicates in what direction (angle) the light is emitted from the light source and at what intensity. The "divergence angle" is the angle at which light spreads. The divergence angle also includes the angle of the condensed light. The optical unit 2 is, for example, an optical component.

Optical unit 2 enters light R1. The optical unit 2 converts the incident light R1 into light R2. The light R2 includes at least one of a converging light component and a diverging light component. The optical unit 2 changes the traveling direction of the light R1 by at least one of refraction of light and reflection of light. The optical unit 2 changes the traveling direction of the light R1 and emits the light R2. The optical unit 2 is a light deflection unit.

For example, the optical unit 2 changes the divergence angle of the incident light R1. The divergence angle of the light R2 is smaller than the divergence angle of the light R1. The light R2 can include convergent light, parallel light, and divergent light. The optical unit 2 is also called a light collecting unit.

The optical axis of the optical unit 2 is indicated by C2. In the first embodiment, the optical axis C1 and the optical axis C2 are located on the same axis. However, the light source unit 1 and the optical unit 2 may be arranged so that the optical axis C2 is inclined with respect to the optical axis C1. The light source unit 1 and the optical unit 2 may be arranged so that the optical axis C2 is eccentric with respect to the optical axis C1.

FIG. 3 is a diagram showing a main configuration and a main path of light passing through the optical unit 2 in the case of the illumination function of the projection device 100. FIG. 4 is a diagram showing a main configuration and a main path of light passing through the optical unit 2 in the case of the projection function of the projection device 100. 5A and 5B are a side view and a front view schematically showing the outer appearance of the optical unit 2 of the projection device 100.

The optical section 2 has a central portion 20a and a peripheral portion 20b.

The central portion 20a is a part of the optical unit 2. The optical axis C2 of the optical unit 2 passes through the central portion 20a. That is, the optical axis C2 exists in the central portion 20a of the optical unit 2. The central portion 20a is, for example, the central portion of the optical unit 2 centered on the optical axis C2. The central portion 20a is also called the first central portion.

Note that the terms "first" and "second" used in the description of the embodiment are for facilitating the description of the embodiment and have no relation to the description other than the embodiment.

The central portion 20a has an entrance surface 21 and an exit surface 23. The incident surface 21 receives the light R1. The emission surface 23 emits the light R2. The light R2 includes light R2a and light R2b. The light R2 includes light R2c and light R2d.

The entrance surface 21 becomes narrower, for example, in the +Z axis direction. The incident surface 21 has a tapered shape. In the first embodiment, the tapered shape is the shape of a rotating body centered on the optical axis C2. The rotating body is a solid figure obtained by rotating a plane curve with a straight line in the same plane as a rotation axis. The cross section of the entrance surface 21 on the plane including the optical axis C2 is, for example, a curved surface shape that is convex toward the exit surface 23 side. The light R1 is refracted when entering from the entrance surface 21, for example. The incident surface 21 has an intersection with the optical axis C2 of the optical unit 2.

The incident surface 21 includes a surface 21a and a surface 21b. A surface 21b is formed at the top of the convex shape. A surface 21a is formed at the portion reaching the apex of the convex shape. For example, if the convex shape is a truncated cone shape, the surface 21b corresponds to the upper surface. The upper surface is a small circular surface of a truncated cone. The bottom surface is a large circular surface of a truncated cone. The surface 21a corresponds to the side surface. The light R1 is deflected by the surface 21a toward the reflecting surface 22. Then, the light R1 transmitted through the surface 21a reaches the reflecting surface 22. The light R1 is not deflected by the surface 21b toward the reflecting surface 22. Then, the light R1 transmitted through the surface 21b reaches the emission surface 23.

The shape of the incident surface 21 is not limited to that shown in the figure. For example, the incident surface 21 may have another shape such as a polygonal shape in which a plurality of flat surfaces are connected. In this case, the polygonal shape can be a shape approximate to a curved surface shape.

The exit surface 23 is formed on the +Z axis direction side of the entrance surface 21. The emission surface 23 has an intersection with the optical axis C2 of the optical unit 2.

The shape of the emitting surface 23 is not limited to that shown in the figure. For example, the emission surface 23 may have a concave shape, a convex shape, or a polygonal shape in which a plurality of flat surfaces are connected.

The peripheral portion 20b is another part of the optical unit 2. That is, the peripheral portion 20b is a part of the optical unit 2 different from the central portion 20a. The peripheral portion 20b is a portion outside the central portion 20a in the radial direction with the optical axis C2 as the center. The peripheral portion 20b is located on the outer peripheral side of the central portion 20a with the optical axis C2 as the center. The peripheral part 20b is a part inside the outer peripheral surface of the optical part 2 and outside the central part 20a. The peripheral portion 20b is also referred to as a first peripheral portion.

The peripheral portion 20b has a reflection surface 22 that reflects the light R1. The peripheral portion 20b includes an emission surface 24 that emits the light R1.

The reflecting surface 22 reflects the incident light. The reflecting surface 22 reflects the light R1 incident from the incident surface 21. The reflecting surface 22 is, for example, an outer peripheral surface of the optical unit 2. The reflecting surface 22 reflects the light R1 in a direction in which the light R1 approaches the optical axis C2. The reflection surface 22 is, for example, a total reflection surface. In addition, the cross section of the reflecting surface 22 on a plane including the optical axis C2 is, for example, a concave shape when viewed from the light traveling inside the optical unit 2. The cross section of the reflection surface 22 is, for example, a concave curved surface shape.

The shape of the reflecting surface 22 is not limited to that shown in the figure. For example, the reflecting surface 22 may have another shape such as a polygonal shape in which a plurality of flat surfaces are connected. In this case, the polygonal shape can be a shape approximate to a curved surface shape.

The emission surface 24 emits the light R1 reflected by the reflection surface 22. The emission surface 24 is located on the outer peripheral side of the emission surface 23 around the optical axis C2. In the first embodiment, the emission surface 23 and the emission surface 24 form the same plane, for example. This same plane is the exit surface 25. The emission surface 25 includes an emission surface 23 and an emission surface 24. In such a case, the emission surfaces 23 and 24 are the

areas

23 and 24 of the emission surface 25. Note that a different step can be provided by providing a step or the like between the emission surface 23 and the emission surface 24.

The shape of the emitting surface 24 is not limited to that shown in the figure. For example, the emission surface 24 may have a concave shape, a convex shape, or a polygonal shape in which a plurality of flat surfaces are connected.

The central portion 20a and the peripheral portion 20b are integrally formed of the same material, for example. However, the central portion 20a and the peripheral portion 20b may be formed of different materials, for example. The optical part 2 may be a combination of the central portion 20a and the peripheral portion 20b.

Optical part 2 is made of, for example, a transparent resin. The material of the optical unit 2 is not limited to the transparent resin. The material of the optical unit 2 may be a photorefractive material of another material that transmits light. The photorefractive material is a material that refracts light.

The incident surface 21 is formed in the central portion 20a. The light R1 that reaches the incident surface 21 is refracted at the incident surface 21. That is, the light R1 is deflected by the incident surface 21. The light R1 refracted at the incident surface 21 travels toward the reflective surface 22. The light R1 refracted at the incident surface 21 travels in a direction toward the reflecting surface 22. The direction toward the reflecting surface 22 is such that as the light R1 advances, the distance from the optical axis C2 increases. The light deflected by the incident surface 21 reaches the reflecting surface 22. However, a part of the light deflected by the entrance surface 21 reaches the exit surface 23 or the exit surface 24 directly.

The light R2a shown in FIG. 3, for example, is emitted from the emission surface 23. Alternatively, for example, the light R2c shown in FIG. 4 is emitted from the emission surface 23. The light R2a and the light R2c are a part of the light R2 emitted from the optical unit 2. The light R2a and the light R2c are light that is incident from the incident surface 21 and directly emitted from the emitting surface 23.

The light R2a and the light R2c reach the image forming area 31 of the image forming unit 3. The light R2a is light in a state where the distance P is the distance P1. That is, the light R2a is light in a state where the projection device 100 has an illumination function. The light R2c is light in a state where the distance P is the distance P2. That is, the light R2c is light in a state where the projection device 100 has a projection function. The distance P is the distance from the light source unit 1 to the optical unit 2. The distance P is the distance from the light emitting surface 11 of the light source unit 1 to the optical unit 2.

The light R2a and the light R2c are incident from the plane-shaped portion (that is, the surface 21b) formed at the +Z-axis side end of the incident surface 21. This plane-shaped portion is, for example, a plane perpendicular to the optical axis C2. The light R2a and the light R2c are lights that are not deflected by the incident surface 21 toward the reflecting surface 22.

The light R2b shown in FIG. 3, for example, is emitted from the emission surface 24. Alternatively, for example, the light R2d shown in FIG. 4 is emitted from the emission surface 24. The light R2b and the light R2d are a part of the light R2 emitted from the optical unit 2. The light R2b and the light R2d are light that enters from the incident surface 21, is reflected by the reflecting surface 22, and exits from the emitting surface 24.

The light R2b reaches the peripheral area 32 of the image forming unit 3. The light R2b is light in a state where the distance P is the distance P1. That is, the light R2b is light in a state where the projection device 100 has an illumination function. The light R2d reaches the image forming area 31 of the image forming unit 3. The light R2d is light in a state where the distance P is the distance P2. That is, the light R2d is light in a state where the projection device 100 has a projection function.

In the first embodiment, the optical unit 2 is a single optical component. However, the optical unit 2 may be configured by combining a plurality of optical components.

<<1-4>> Image forming unit 3
The image forming unit 3 converts incident light into image light. The image forming unit 3 includes an image forming area 31 and a peripheral area 32. The light R2 emitted from the optical unit 2 enters at least one of the image forming area 31 and the peripheral area 32. The image forming unit 3 is, for example, an image forming component.

6A and 6B are a side view and a front view schematically showing the outer appearance of the image forming unit 3 of the projection device 100.

The image forming area 31 forms an image. The image forming area 31 converts the incident light R2 into image light. The image formed in the image forming area 31 is projected by the optical unit 4. The image 33 formed in the image forming area 31 corresponds to the image 72 projected in the target area 6. The image 72 is a projection image of the image 33. "Projection" is to transfer the shape of an object to some surface. The "projected image" is an image that has been projected. Here, the surface on which the projected image is projected is the target area 6. For example, the image forming area 31 includes an intersection with the optical axis C2 of the optical unit 2. The light R2 passes through the image forming area 31 and becomes image light.

In the image forming area 31, a light transmitting area and a light shielding area are formed. An image 33 is formed in the image forming area 31 by the light transmitting area and the light shielding area. That is, the image forming area 31 transmits a part of the light R2 emitted from the optical unit 2. Further, the image forming area 31 blocks the other part of the light R2 emitted from the optical unit 2.

The incident light R2 is converted into image light by the image forming area 31. The image light passes through the optical unit 4 and is projected onto the target area 6. The image 72 is projected on the target area 6 by the projection of the image light.

The image forming area 31 is, for example, a liquid crystal element. The liquid crystal element is also called a liquid crystal panel or a liquid crystal light valve. The liquid crystal panel transmits a part of the incident light and blocks another part of the incident light by the polarization filter. For example, an image signal is input to the image forming unit 3. The image signal is a signal including image information. The image forming unit 3 forms an image 33 based on the image signal in the image forming area 31. The liquid crystal panel can change the projected image 72 according to the input image signal. Further, the liquid crystal panel can make the projected image 72 a moving image. A region including the image forming region 31 and the peripheral region 32 can be a liquid crystal element. The region of the liquid crystal element corresponding to the peripheral region 32 transmits light when the illumination function is selected. Further, the region of the liquid crystal element corresponding to the peripheral region 32 can block light when the projection function is selected.

The image forming area 31 may be, for example, a light shielding plate including an area that blocks light. For example, the image forming area 31 may be a light blocking plate having an arrow-shaped opening. This opening allows light to pass through. The light blocking plate may be formed of a light blocking film that blocks light. The light shielding film is an example of a light shielding plate. In this case, the image 72 corresponding to the opening is projected.

The light shield plate is, for example, a metal plate such as stainless steel. The light shielding plate may be composed of, for example, a base material such as glass and a light shielding film such as chromium or aluminum applied to the base material. The baffle does not change the projected image 72. When the light shielding plate is used, the image forming unit 3 projects one type of image 72. The image forming unit 3 can project an image 72 of any of a plurality of types of images by replacing a light blocking plate having a certain opening with a light blocking plate having another opening.

Also, the light shielding plate may be composed of a rotating plate provided so as to rotate. The rotary plate is a light blocking member including a plurality of images. In this case, by rotating the light shielding plate, any one of the plurality of types of images becomes the image 33 of the image forming area 31. The image forming unit 3 can project the image 72 based on the selected image 33.

The image forming unit 3 may be, for example, a display element including a plurality of micromirrors. This display element includes, for example, a plurality of micromirrors arranged two-dimensionally. The image 33 is formed by tilting a plurality of micromirrors. This display element is, for example, DLP (Digital Light Processing, registered trademark) or DMD (Digital Micromirror Device, registered trademark) using MEMS (Micro Electro Mechanical Systems) technology. “MEMS” is a device or system in which minute electric components and mechanical components are incorporated on one substrate. The display element using the micromirror can change the projected image 72 based on the image information. Further, when the image forming unit 3 employs a display element using a micromirror, the projected image 72 can be a moving image.

When the projection function is selected, the projection device 100 increases the light R2 transmitted through the image forming area 31. The light R2 transmitted through the image forming area 31 is, for example, the light R2c and the light R2d shown in FIG.

The peripheral area 32 is formed on the outer peripheral side of the image forming area 31 around the optical axis C2. The peripheral area 32 is located on the peripheral side of the image forming area 31. The peripheral region 32 transmits, for example, light. The peripheral region 32 is formed of, for example, a light transmissive member. The light transmissive member is a member that transmits light. However, the peripheral region 32 does not necessarily have to be formed of a light transmissive member. The peripheral region 32 may be a space through which light passes. That is, the image forming unit 3 may include only the image forming area 31. The light R2 passes through the peripheral region 32 and becomes the illumination light 71. The peripheral region 32 can change the light distribution of the transmitted light by providing a lens surface or the like.

The peripheral area 32 is made of, for example, glass or transparent resin. When the illumination function is selected, the projection device 100 increases the light R2 transmitted through the peripheral region 32. The light R2 transmitted through the peripheral region 32 is, for example, the light R2b shown in FIG.

The peripheral area 32 can also have a function as a holding unit that holds the image forming area 31. Therefore, the size or thickness of the peripheral region 32 may be set to a desired size and thickness. That is, the peripheral region 32 is not particularly limited as long as it is configured to transmit the light R2.

<<1-5>> Optical unit 4
The optical unit 4 projects the incident light. The optical unit 4 enters the light R3. The light R3 includes light R31 and light R32. The optical unit 4 converts the incident light R3 into light R4. The light R4 includes at least one of illumination light and image light. The light R4 includes light R4a and light R4b. The optical unit 4 changes the traveling direction of the light R3 by at least one of refraction of light and reflection of light. The optical unit 4 changes the traveling direction of the light R3 and emits the light R4. The optical unit 4 is a light deflection unit. The optical unit 4 is, for example, an optical component.

As shown in FIG. 1, the optical unit 4 irradiates the target area 6 with the illumination light 71. The optical unit 4 directs the light R4b that has passed through the peripheral region 32 of the image forming unit 3 to the target region 6. The optical unit 4 deflects the light transmitted through the peripheral region 32 of the image forming unit 3 and directs the light toward the target region 6. The light R4b is projected as the illumination light 71 on the target area 6. The light R4b is projected on the target area 6.

Further, as shown in FIG. 2, the optical unit 4 projects the image 72 on the target region 6. The optical unit 4 directs the light R4a that has passed through the image forming area 31 of the image forming unit 3 to the target area 6. The optical unit 4 deflects the light transmitted through the image forming area 31 of the image forming unit 3 and directs the light toward the target area 6. The light R4a is projected as an image 72 on the target area 6. The light R4a is projected on the target area 6. The light R4a is also called image light. The optical unit 4 is also called a projection unit.

The optical axis of the optical unit 4 is indicated by C4. In the first embodiment, the optical axis C2 and the optical axis C4 coincide with each other. That is, the optical axis C2 and the optical axis C4 are located on the same axis. However, the optical unit 4 and the optical unit 2 may be arranged so that the optical axis C4 is inclined with respect to the optical axis C2. Further, the optical unit 4 and the optical unit 2 may be arranged so that the optical axis C4 is eccentric with respect to the optical axis C2.

FIG. 7 is a diagram showing the optical unit 4 of the projection device 100 and a main path of light passing through the optical unit 4. 8A and 8B are a side view and a front view schematically showing the outer appearance of the optical unit 4 of the projection device 100.

The optical unit 4 includes, for example, refracting

surfaces

41, 42, 44 and a reflecting surface 43. The optical unit 4 is, for example, a lens. The reflection surface 43 is, for example, a total reflection surface.

The optical unit 4 has a central portion 40a and a peripheral portion 40b.

The central portion 40a is a part of the optical unit 4. The optical axis C4 of the optical unit 4 passes through the central portion 40a. That is, the optical axis C4 of the optical unit 4 exists within the central portion 40a. The central portion 40a is the central portion of the optical unit 4 centered on the optical axis C4. The central portion 40a is also called the second central portion. The optical axis of the central portion 40a is the optical axis C4.

The central portion 40a projects image light. The central portion 40 a projects the image light emitted from the image forming area 31 of the image forming section 3 onto the target area 6. The central portion 40 a projects the image 33 formed in the image forming area 31 of the image forming unit 3 onto the target area 6 as the image 72.

The central portion 40a is, for example, a projection lens. The central portion 40a is, for example, a convex lens. The central portion 40a includes, for example, a convex lens. The central portion 40a may be a biconvex lens or a plano-convex lens. The central portion 40a may be, for example, a cylindrical lens or a toroidal lens. The central portion 40a includes an entrance surface 41 and an exit surface 44. The incident surface 41 receives the light R3. The emission surface 44 emits the light R4.

The image 72 projected on the target area 6 is an image based on the image 33 formed on the image forming area 31. The optical unit 4 enlarges the image 33 formed in the image forming area 31 and projects it on the target area 6. The projected image 72 is an enlargement of the image 33 formed in the image forming area 31. Further, the projected image 72 is the image formed in the image forming area 31 with the vertical and horizontal directions reversed.

The peripheral portion 40b is another part of the optical unit 4. The peripheral portion 40b is a part of the optical unit 4 different from the central portion 40a. The peripheral portion 40b is formed on the outer peripheral side of the central portion 40a with the optical axis C4 as the center. That is, the peripheral portion 40b is arranged outside the center portion 40a in the radial direction with the optical axis C4 as the center. The peripheral portion 40b is also referred to as a second peripheral portion. The optical axis of the peripheral portion 40b is the optical axis C4.

The peripheral portion 40b emits the light R32 as the illumination light 71. The peripheral portion 40b irradiates the target region 6 with the light R32 as the illumination light 71. The light R32 is light emitted from the peripheral region 32 on the image forming unit 3.

The peripheral portion 40b has an incident surface 42. The peripheral portion 40b includes a reflective surface 43. The peripheral portion 40b includes an emission surface 45.

The incident surface 42 is formed on the outer peripheral side of the incident surface 41 centered on the optical axis C4. The outer peripheral end 42a of the incident surface 42 is located on the −Z axis direction side of the inner peripheral end 42b of the incident surface 42. The outer peripheral end 42 a of the incident surface 42 is located closer to the image forming unit 3 side than the inner peripheral end 42 b of the incident surface 42. The incident surface 42 is in the shape of a rotating body with the optical axis C4 as the central axis. The shape of the incident surface 42 is not limited to that shown in the figure. For example, the incident surface 42 may have a curved surface shape or a polygonal shape in which a plurality of flat surfaces are connected. An outer end 41 a of the incident surface 41 is connected to an inner end 42 b of the incident surface 42.

The reflecting surface 43 is the outer peripheral surface of the optical unit 4. The cross section of the reflecting surface 43 is, for example, a concave shape when viewed from the light traveling inside the optical unit 4. The cross section of the reflecting surface 43 has, for example, a curved shape. The reflecting surface 43 has a rotating body shape with the optical axis C4 as the central axis. The outer peripheral side end 43 a of the reflecting surface 43 is connected to the outer peripheral side end 45 a of the emitting surface 45.

The shape of the reflecting surface 43 is not limited to that shown in the figure. For example, the reflecting surface 43 may have another shape such as a polygonal shape in which a plurality of flat surfaces are connected. In this case, the polygonal shape can be a shape approximate to a curved surface shape.

The emission surface 45 is formed on the outer peripheral side of the emission surface 44 centered on the optical axis C4. In the first embodiment, the emission surface 45 is located on the +Z axis direction side of the emission surface 44. The connection surface 46 connects the outer peripheral side end 44 a of the emitting surface 44 and the inner peripheral side end 45 b of the emitting surface 45. The emission surface 45 is, for example, a surface perpendicular to the optical axis C4.

The shape of the emitting surface 45 is not limited to that shown in the figure. For example, the emission surface 45 may have a curved surface shape or a polygonal shape in which a plurality of flat surfaces are connected.

The central portion 40a and the peripheral portion 40b are integrally formed of the same material, for example. However, the optical part 4 may be one in which the central portion 40a and the peripheral portion 40b are joined.

The optical part 4 is made of, for example, a transparent resin. The material of the optical unit 4 is not limited to the transparent resin. The material of the optical unit 4 may be a photorefractive material of another material that transmits light.

In the first embodiment, the optical unit 4 is a single optical component. However, the optical unit 4 may be composed of a combination of a plurality of optical components.

<<1-6>> moving unit 5 and

control units

81, 82, 83, 84
The moving unit 5 moves a member of the optical system. The moving unit 5 changes the distance P from the light source unit 1 to the optical unit 2. The moving unit 5 changes the distance P in the optical axis C1 direction between the light source unit 1 and the optical unit 2. The optical axis C1 direction is, for example, the Z-axis direction. The moving unit 5 changes the distance P in the optical axis C2 direction between the light source unit 1 and the optical unit 2. The optical axis C2 direction is, for example, the Z-axis direction.

The moving unit 5 switches the state of the projection device 100 to the state of the illumination function or the state of the projection function. The moving unit 5 is, for example, a moving component. The moving unit 5 is a component that switches the state of the projection device 100 to the state of the illumination function or the state of the projection function.

The moving unit 5 moves at least one of the light source unit 1 and the optical unit 2. In the first embodiment, the moving unit 5 moves the optical unit 2. The moving unit 5 moves the optical unit 2 with respect to the light source unit 1. The moving unit 5 moves the optical unit 2 in a direction parallel to the optical axis C1. The moving unit 5 moves the optical unit 2 in a direction parallel to the optical axis C2. In FIG. 1, the moving unit 5 moves the optical unit 2 in the Z-axis direction.

The moving unit 5 may move the light source unit 1 instead of the optical unit 2 or in addition to the optical unit 2. The moving unit 5 moves the light source unit 1. The moving unit 5 moves the light source unit 1 in a direction parallel to the optical axis C1. The moving unit 5 moves the light source unit 1 in a direction parallel to the optical axis C2. The moving unit 5 moves the light source unit 1 with respect to the optical unit 2. The moving unit 5 moves at least one of the light source unit 1 and the optical unit 2.

The moving unit 5 changes the traveling direction of the light R2 emitted from the optical unit 2. The moving unit 5 is an example of a changing unit that changes the traveling direction of the light R2 emitted from the optical unit 2.

When the traveling direction of the light R2 emitted from the optical unit 2 is changed, the amount of the light R2 entering the image forming area 31 and the amount of the light R2 entering the peripheral area 32 are changed.

1 and 3 show a state in which the optical unit 2 of the projection device 100 is in the initial position. At this time, the projection device 100 functions as a lighting device. At this time, the distance P from the light source unit 1 to the optical unit 2 is P1.

2 and 4 show a state in which the optical unit 2 of the projection device 100 is in another position. 2 and 4 show a state in which the optical unit 2 of the projection device 100 is at a position different from the initial position. At this time, the projection device 100 functions as a projection device. At this time, the distance P from the light source unit 1 to the optical unit 2 is P2. The distance P2 is longer than the distance P1 (P2>P1). That is, the movement amount of the optical unit 2 is a value (P2-P1) obtained by subtracting the distance P1 from the distance P2.

The moving unit 5 includes a support mechanism 51 and a driving force generating unit 52.

The support mechanism 51 supports the optical unit 2. The support mechanism 51 is an example of a support part. When moving the optical unit 2, the support mechanism 51 may support the light source unit 1 instead of the optical unit 2.

The driving force generation unit 52 provides the optical unit 2 with linear movement. The driving force generator 52 provides a linear motion to the optical unit 2 via the support mechanism 51. The driving force generator 52 is, for example, a driving mechanism using a feed screw. A feed screw is a mechanical component that converts a rotational movement into a linear movement by using a screw shaft and a nut. The screw shaft is also called a lead screw.

The driving force generator 52 includes, for example, a screw shaft and a nut portion. In the first embodiment, the optical section 2 is supported by the nut section via the support mechanism 51, for example. The nut portion meshes with the screw shaft. The moving unit 5 rotates the screw shaft. For example, a motor rotates a screw shaft. The nut portion moves in the longitudinal direction of the screw shaft as the screw shaft rotates. However, the configuration of the moving unit 5 is not limited to the above example. The driving force generation unit 52 can employ a driving mechanism using another magnetic force. Further, the moving unit 5 may employ a rack and pinion mechanism instead of the feed screw mechanism.

The distance P is the distance from the light source unit 1 to the optical unit 2. FIG. 1 shows a state in which the distance P is the distance P1. FIG. 2 shows a state in which the distance P is the distance P2.

The light quantity Q1c is the light quantity of the light R2 incident on the image forming area 31 when the distance P is the distance P1. The light quantity Q2c is the light quantity of the light R2 incident on the image forming area 31 when the distance P is the distance P2. The light quantity Q1c is smaller than the light quantity Q2c. As shown in FIG. 2, in the case of the distance P2, the amount of the light R2 incident on the image forming area 31 is larger than that in the case of the distance P1. At this time, the image 72 projected on the target area 6 is displayed brighter than in the case of FIG.

The light quantity Q1p is the light quantity of the light R2 incident on the peripheral region 32 when the distance P is the distance P1. The light amount Q2p is the light amount of the light R2 incident on the peripheral region 32 when the distance P is the distance P2. The light quantity Q1p is larger than the light quantity Q2p. As shown in FIG. 1, in the case of the distance P1, the amount of the light R2 incident on the peripheral region 32 is larger than that in the case of the distance P2. At this time, the illumination light 71 projected on the target area 6 is brighter than in the case of FIG. Further, the projected image 72 is displayed in an unclear state with low illuminance.

The projector 100 changes the ratio of the amount of light R2 entering the image forming area 31 and the amount of light R2 entering the peripheral area 32 by changing the light distribution.

The light source drive unit 81 is, for example, a circuit that drives the light source unit 1. The light source drive unit 81 turns on or off the light source unit 1 or changes the light amount. The movement control unit 82 is, for example, a circuit that drives the movement unit 5. The movement control unit 82 moves the optical unit 2 via the moving unit 5.

The display control unit 83 is, for example, a circuit that drives the image forming area 31 of the image forming unit 3. The display control unit 83 displays an image in the image forming area 31, for example. When the image forming area 31 is a liquid crystal element or a display element including a plurality of micromirrors, the display control unit 83 causes the image forming area 31 to display the image 33 based on a signal including image information. When the image forming area 31 is the rotating plate of the light blocking member including a plurality of images, the display control unit 83 rotates the rotating plate to select the image 33 to be displayed. When the image forming area 31 is a light blocking plate that displays one type of image 33, the projection device 100 does not have to include the display control unit 83.

The control unit 84 is, for example, a circuit that controls the entire device. The control unit 84 drives at least one of the light source drive unit 81, the movement control unit 82, the display control unit 83, and the control unit 84. The control unit 84 includes, for example, a memory and a processor. The memory is a storage unit that stores a program. The processor is an arithmetic unit that executes a program.

Alternatively, the user may manually move the optical unit 2 supported by the moving unit 5. In this case, the projection device 100 may not include the movement control unit 82.

<<1-7>> Operation of Projection Device 100 <<1-7-1>> State of Illumination Function FIG. 3 shows a state of the illumination function of the projection device 100. In the state of the illumination function, for example, the optical unit 2 is in the initial position. At this time, the distance P from the light source unit 1 to the optical unit 2 is P1.

In the state of the illumination function, the light R2b is condensed between the optical section 2 and the image forming section 3.

As shown in FIG. 3, in the state of the illumination function, the light R1 emitted from the light source unit 1 reaches the incident surface 21 of the optical unit 2. The light R1 that reaches the incident surface 21 is refracted by the incident surface 21. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 21. The light R1 is, for example, deflected and travels in a direction away from the optical axis C2.

A part of the light R1 deflected by the entrance surface 21 passes through the central portion 20a and exits from the exit surface 23. That is, the light R2a is emitted from the emission surface 23. The light R2a emitted from the emission surface 23 travels toward the image forming area 31. The light R2a emitted from the central portion 20a enters the image forming area 31 of the image forming unit 3. That is, the light R2a enters the image forming area 31. The light R2a is converted into image light by the image forming area 31. In FIG. 3, the light R1 incident on the incident surface 21b is emitted from the emitting surface 23 as the light R2a. When the incident surface 21b is a plane perpendicular to the optical axis C2, the deflection amount of the light R1 is small.

Another part of the light deflected by the incident surface 21 reaches the reflecting surface 22. That is, the light R2b is reflected by the reflecting surface 22. The reflecting surface 22 is an outer peripheral surface of the optical unit 2. The light R2b reflected by the reflecting surface 22 travels toward the emitting surface 24. The reflection of the light R2b on the reflection surface 22 is, for example, total reflection. In FIG. 3, the light R1 incident on the incident surface 21a reaches the reflecting surface 22.

▽ "Total reflection" refers to the effect that incident light is reflected without passing through the boundary surface. Here, when the light traveling in the optical unit 2 reaches the boundary surface between the optical unit 2 and the space outside the optical unit 2, the light is reflected without being transmitted through the boundary surface. In FIG. 3, the boundary surface is the reflecting surface 22.

In FIGS. 3 and 4, the peripheral portion 20b is shown separately from the

peripheral portions

20b ₁ and 20b ₂ for ease of explanation. Similarly, in FIG. 3 and FIG. 4, the peripheral region 32 of the image forming unit 3 is shown separately from the

peripheral regions

32a and 32b for ease of description.

The light R2b reflected by the reflecting surface 22 is emitted from the peripheral portion 20b of the optical unit 2. The light R2b reflected by the reflecting surface 22 is emitted from the emitting surface 24.

As shown in FIG. 3, the light R2b emitted from the peripheral portion 20b of the optical unit 2 reaches the peripheral region 32 of the image forming unit 3 on the opposite side of the optical axis C2. For example, the light R2b emitted from the peripheral portion 20b ₁ shown in the upper side of FIG. 3, to reach the peripheral region 32b shown on the lower side of FIG. Similarly, light R2b emitted from the peripheral portion 20b ₂ shown on the lower side of FIG. 3, to reach the peripheral region 32a shown in the upper side of FIG.

That is, in the state of the illumination function, the light R2b emitted from the peripheral portion 20b reaches the peripheral region 32. In the state of the illumination function, the light R2b emitted from the peripheral portion 20b reaches the peripheral area 32 on the opposite side across the optical axis C2. The light R2 reflected by the reflecting surface 22 reaches the peripheral region 32 located on the opposite side of the reflected reflecting surface 22 with respect to the optical axis C2. The light that has passed through the peripheral region 32 is projected onto the target region 6 as the illumination light 71 by the optical unit 4.

The reflecting surface 22 of the optical unit 2 may be a mirror surface. The mirror surface is, for example, a surface formed by vapor deposition of a metal for a mirror on the surface of the base material. In this case, the optical part 2 does not need to be a refractive material. In this case, the optical unit 2 is, for example, a tubular member having a hollow inside. The tubular shape is, for example, a shape formed by the side surface of a truncated cone. The mirror surface is formed inside the cylindrical side surface.

However, it is desirable that the reflection surface 22 of the optical unit 2 be a total reflection surface. This is because the total reflection surface has a higher reflectance than the mirror surface and can improve the light utilization efficiency.

When the projection device 100 is in the illumination function state, the light R2a emitted from the optical unit 2 is unnecessary light. This is because the light R2a is converted into image light by the image forming area 31 of the image forming unit 3. “Unnecessary light” is light that is unnecessary for the product. However, the influence of the image light can be reduced by reducing the light amount of the light R2a with respect to the light amount of the light R2b. The light distribution in the state of the illumination function is mainly formed by the light R2b. Therefore, it is desirable that the light amount of the light R2a toward the image forming area 31 is small. Further, when the image forming area 31 can change the amount of light transmission like a liquid crystal element, the image forming area 31 may be set in a state of high light transmittance and the light R2a may be used as illumination light. ..

<<1-7-2>> State of Projection Function FIG. 4 shows a state of the projection function of the projection apparatus 100. In the case of the state of the projection function, for example, the optical unit 2 is at the position moved in the +Z-axis direction from the initial position. At this time, the distance P from the light source unit 1 to the optical unit 2 is P2. The distance P2 is longer than the distance P1 (P2>P1).

In the case of the projection function state, the light R2d is condensed on the image forming unit 3. The distance from the optical part 2 of the light R2d to the condensing position is longer than the distance from the optical part 2 of the light R2b to the condensing position. This is because the distance P becomes P2 and the angle of incidence of the light R1 on the reflecting surface 22 becomes large.

As shown in FIG. 4, in the case of the projection function state, the light R1 emitted from the light source unit 1 reaches the incident surface 21 of the central portion 20a of the optical unit 2. The light R1 that reaches the incident surface 21 is refracted by the incident surface 21. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 21. The light R1 is, for example, deflected and travels in a direction away from the optical axis C2.

A part of the light R1 deflected by the entrance surface 21 passes through the central portion 20a and exits from the exit surface 23. That is, the light R2c is emitted from the emission surface 23. The light R2c emitted from the emission surface 23 travels toward the image forming area 31. The light R2c emitted from the central portion 20a enters the image forming area 31 of the image forming unit 3. That is, the light R2c emitted from the emission surface 23 enters the image forming area 31. At this time, the light R2c is converted into image light by the image forming area 31. In FIG. 4, the light R1 incident on the incident surface 21b is emitted from the emitting surface 23 as the light R2c. When the incident surface 21b is a plane perpendicular to the optical axis C2, the deflection amount of the light R1 is small.

The route of the light R2c is the same as the route of the light R2a in FIG.

Another part of the light deflected by the incident surface 21 reaches the reflecting surface 22. That is, the light R2d is reflected by the reflecting surface 22. The light R2d reflected by the reflecting surface 22 travels toward the emitting surface 24. The reflection of the light R2d on the reflection surface 22 is, for example, total reflection. In FIG. 4, the light R1 incident on the incident surface 21a reaches the reflecting surface 22.

The light R2d reflected by the reflecting surface 22 is emitted from the peripheral portion 20b of the optical unit 2. The light R2d reflected by the reflecting surface 22 is emitted from the emitting surface 24.

The light R2d emitted from the emission surface 24 travels toward the image forming area 31. The light R2d emitted from the peripheral portion 20b enters the image forming area 31 of the image forming unit 3. That is, the light R2d enters the image forming area 31. The light R2d is converted into image light by the image forming area 31.

The path of the light R2d is different from the path of the light R2b in FIG. In FIG. 4, the path of the light R2d is different from the path of the light R2b in that the light R2d reaches the image forming area 31 of the image forming unit 3. The light R2d is emitted from the peripheral portion 20b of the optical unit 2. That is, in FIG. 4, the light R2d emitted from the peripheral portion 20b ₁ of the optical unit 2 reaches the image forming area 31 of the image forming unit 3. Similarly, in FIG. 4, the light R2d emitted from the peripheral portion 20b ₂ of the optical unit 2 reaches the image forming area 31 of the image forming section 3.

The light R2d and the light R2c are converted into image light by the image forming area 31. The image light is projected by the optical unit 4. As a result, the image 72 is projected onto the target area 6.

In the state of the projection function, the light R2d is condensed on the image forming unit 3 by the optical unit 2, for example. However, when the light R2d enters the image forming area 31, the light R2c does not necessarily need to be condensed on the image forming unit 3. The light R2d and the light R2c may be applied to the image forming area 31.

<<1-7-3>> Projection of Light of Optical Unit 4 FIG. 7 shows main paths of light passing through the optical unit 4 of the projection device 100. FIG. 7 is a diagram showing the relationship between the optical unit 4, the image forming unit 3, and the target area 6 of the projection device 100. In FIG. 7, both the light R4a and the light R4b are shown. The light R4a is light in a state where the projection device 100 has a projection function. The light R4b is light with which the projection device 100 is in the illumination function.

The light R32 is light emitted from the peripheral region 32. Then, the light R32 is incident on the peripheral portion 40b of the optical unit 4. That is, when the projection device 100 is in the illumination function state, the light R32 follows the light path shown in FIG. The light R32 indicates the main light emitted from the peripheral region 32. Therefore, not all the light emitted from the image forming unit 3 follows the same light path as the light R32.

The peripheral portion 40b includes an entrance surface 42, a reflection surface 43, and an exit surface 45. The light R32 is incident on the incident surface 42 of the optical unit 4. The light R32 incident on the incident surface 42 is refracted. Further, the light R32 incident from the incident surface 42 is reflected by the reflecting surface 43. Then, the light R32 reflected by the reflecting surface 43 is emitted from the peripheral portion 40b. The light R32 reflected by the reflecting surface 43 is emitted from the emitting surface 45. The light R32 reflected by the reflecting surface 43 is emitted as the light R4b. The light R4b is applied to the area of the illumination light 71 on the target area 6.

The light R31 is incident on the central portion 40a of the optical unit 4. The light R31 is light emitted from the image forming area 31. That is, the light R31 is image light. When the projection device 100 is in the projection function state, the light R31 follows the light path shown in FIG. The light R31 indicates the main light emitted from the image forming area 31. Therefore, not all light emitted from the image forming area 31 follows the same light path as the light R31.

The central portion 40a includes an entrance surface 41 and an exit surface 44. The light R31 is incident on the incident surface 41 of the optical unit 4. The light R31 incident on the incident surface 41 is refracted. Then, the light R31 incident from the incident surface 41 is emitted from the central portion 40a. The light R31 incident from the incident surface 41 is emitted from the emission surface 44. The light emitted from the emission surface 44 is the light R4a. The light R4a is applied to the area of the image 72 on the target area 6.

In the light R4a, the image forming area 31 and the target area 6 are optically conjugate with each other. Further, with the light R4b, the image forming area 31 and the target area 6 are not optically conjugate with each other. “Optically conjugated” refers to a relationship in which light emitted from one point forms an image on another point. That is, as shown in FIG. 7, the light R31 emitted from the image forming area 31 forms an image on the target area 6. As a result, the image 33 formed in the image forming area 31 is projected as the image 72 on the target area 6. At this time, the image 72 is inverted and enlarged and projected onto the target area 6.

That is, the optical unit 4 emits the illumination light 71 in the state of the illumination function. Further, the optical unit 4 projects the image 72 in the state of the projection function.

<<1-8>> Effects of Projection Device 100 As described above, according to the projection device 100 according to the first embodiment, the projection of the illumination light 71 and the projection of the image 72 can be switched with a simple configuration. it can.

<<2>> Embodiment 2
FIG. 9 is a diagram showing a main configuration and a main path of light passing through the optical unit 220 in the state of the illumination function of the projection device according to the second embodiment of the present invention. FIG. 10 is a diagram showing a main configuration and a main path of light passing through the optical unit 220 in a projection function state of the projection device according to the second embodiment. 9 and 10, the same or corresponding components as those shown in FIGS. 3 and 4 are designated by the same reference numerals as those shown in FIGS. 3 and 4, and the description thereof is omitted. The projection apparatus according to the second embodiment differs from the projection apparatus 100 according to the first embodiment in the shape of the optical unit 220.

<<2-1>> Configuration of Optical Unit 220 In the projection device according to the second embodiment, the optical unit 220 has a convex lens shape. The optical unit 220 is, for example, a convex lens. The optical unit 220 condenses the light on the optical axis C2. In FIGS. 9 and 10, a plano-convex lens is shown as the optical unit 220. However, the optical unit 220 may be a biconvex lens. In addition, the optical unit 220 may include a plurality of lenses. The optical unit 220 may be formed by combining a plurality of lenses.

The optical section 220 has an entrance surface 221. The optical section 220 includes an emission surface 222. In the second embodiment, the entrance surface 221 has a planar shape. The emission surface 222 has a convex shape.

The optical section 220 includes a central portion 220a and a peripheral portion 220b.

The central portion 220a is a part of the optical unit 220. The optical axis C2 of the optical section 220 passes through the central portion 220a. That is, the optical axis C2 of the optical section 220 exists within the central portion 220a. The central portion 220a is a central portion of the optical section 220 centered on the optical axis C2. The central portion 220a is also called the first central portion. The central portion 220a includes a convex lens.

The peripheral part 220b is another part of the optical part 220. That is, the peripheral portion 220b is a part of the optical unit 220 that is different from the central portion 220a. The peripheral portion 220b is formed on the outer peripheral side of the central portion 220a with the optical axis C2 as the center. The peripheral portion 220b is a portion inside the outer peripheral surface of the optical portion 220 and outside the central portion 220a. The peripheral portion 220b is also referred to as a first peripheral portion. The peripheral portion 220b includes a convex lens.

<<2-2>> State of Illumination Function FIG. 9 shows a state in which the optical unit 220 of the projection device is in the initial position. FIG. 9 shows a case where the projection device is in the state of the illumination function. At this time, the distance P from the light source unit 1 to the optical unit 220 is P1. The position of the focal point F of the optical unit 220 is on the −Z axis direction side of the light source unit 1. The position of the focal point F of the optical unit 220 is on the −Z axis direction side of the light emitting surface 11. The distance P1 from the optical section 220 to the light emitting surface 11 of the light source section 1 is shorter than the focal length f1 of the optical section 220. Here, the focal length f1 is the distance from the incident surface 221 of the optical unit 220 to the focus F.

In the state of the illumination function, the light R1 emitted from the light source unit 1 is refracted by the incident surface 221 of the optical unit 220. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 221. The light R1 deflected by the incident surface 221 passes through the optical unit 220. The light R2 that has passed through the optical unit 220 is emitted from the emission surface 222. The light R2 emitted from the emission surface 222 is divergent light.

The light R2a emitted from the central portion 220a travels toward the image forming area 31 of the image forming unit 3. The light R2a emitted from the central portion 220a enters the image forming area 31. The light R2a emitted from the emission surface 222 enters the image forming area 31. At this time, the light R2a passing through the image forming area 31 becomes image light.

The light R2b emitted from the peripheral portion 220b travels toward the peripheral region 32 of the image forming unit 3. The light R2b emitted from the emission surface 222 enters the peripheral region 32. The light R2b incident on the peripheral region 32 passes through the peripheral region 32 and becomes the illumination light 71.

<<2-3>> State of Projection Function FIG. 10 shows a state in which the optical unit 220 of the projection device is at a position different from the initial position. FIG. 10 shows a case where the projection device is in the projection function. At this time, the distance P from the light source unit 1 to the optical unit 220 is P2. The distance P2 is longer than the distance P1 (P2>P1). Further, the position of the focus F of the optical section 220 is between the light source section 1 and the optical section 220. The position of the focal point F of the optical unit 220 is between the light emitting surface 11 of the light source unit 1 and the optical unit 220. The distance P2 from the optical section 220 to the light emitting surface 11 of the light source section 1 is longer than the focal length f1 of the optical section 220. In the state of the projection function, the optical unit 220 moves in the +Z axis direction as compared with the state of the illumination function.

In the state of the projection function, the light R1 emitted from the light source unit 1 is refracted by the incident surface 221 of the optical unit 220. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 221. The light R1 deflected by the incident surface 221 passes through the optical unit 220. The light R2 that has passed through the optical unit 220 is emitted from the emission surface 222. The light R2 emitted from the emission surface 222 is convergent light.

The light R2c emitted from the central portion 220a travels toward the image forming area 31 of the image forming unit 3. The light R2c emitted from the central portion 220a enters the image forming area 31. The light R2c emitted from the emission surface 222 enters the image forming area 31. At this time, the light R2c passing through the image forming area 31 becomes image light.

The light R2d emitted from the peripheral portion 220b travels toward the image forming area 31 of the image forming unit 3. The light R2d emitted from the peripheral portion 220b enters the image forming area 31. The light R2d emitted from the emission surface 222 enters the image forming area 31. At this time, the light R2d passing through the image forming area 31 becomes image light.

As described above, the projection device according to the second embodiment can switch between illumination light projection and image projection with a simple configuration.

Note that the projection apparatus according to the second embodiment is the same as the projection apparatus 100 according to the first embodiment except for the points described above.

<<3>> Embodiment 3
FIG. 11 is a diagram showing a main configuration and a main path of light passing through the optical unit 230 in the state of the illumination function of the projection device according to the third embodiment of the present invention. FIG. 12 is a diagram showing a main configuration and a main path of light passing through the optical unit 230 in a projection function state of the projection device according to the third embodiment. 11 and 12, constituent elements that are the same as or correspond to the constituent elements shown in FIGS. 9 and 10 are given the same reference numerals as those shown in FIGS. 9 and 10, and description thereof is omitted. The projection apparatus according to the third embodiment differs from the projection apparatus according to the second embodiment in the shape of the optical unit 230.

<<3-1>> Configuration of Optical Unit 230 In the projection device according to the third embodiment, the optical unit 230 has a Fresnel lens shape. The optical section 230 includes a Fresnel lens shape. The optical section 230 has the same performance as the optical section 220.

Fresnel lenses are a series of grooves that replace the curved surface of an optical lens. These grooves act as refracting surfaces individually, and for example, bend the optical paths of parallel rays to collect light at the focal position. Hereinafter, the shape of the mountain formed by the groove will be referred to as a prism. Further, the surface forming the prism is also called a prism surface.

The prism shown in the following embodiments includes a shape in which a lens-shaped prism surface is replaced with a surface parallel to a plane in contact with the lens-shaped prism surface. That is, the prism of the Fresnel lens includes a prism in which both the prism surface on the optical axis side and the prism surface on the peripheral side are flat. The Fresnel lens prism includes a prism whose two surfaces are flat.

In the optical unit 230, for example, a prism having two flat surfaces can be arranged around the lens. In addition, the optical unit 220 may include a plurality of Fresnel lenses. The optical unit 220 may be formed by a combination of optical components in which prisms are arranged around a plurality of lenses.

The optical section 230 has an entrance surface 231. The optical section 230 includes emission surfaces 232 and 233. The emission surface 233 is the emission surface of the central portion 230a. The emission surface 233 has the shape of a lens surface. The emission surface 232 is an emission surface of the peripheral portion 230b. The emission surface 232 has a Fresnel shape. Alternatively, the emission surface 232 has a prism shape. In the third embodiment, the entrance surface 231 has a planar shape. Further, the emission surfaces 232 and 233 have a convex shape.

The optical section 230 includes a central portion 230a and a peripheral portion 230b.

The central part 230a is a part of the optical part 230. The optical axis C2 of the optical section 230 passes through the central portion 230a. That is, the optical axis C2 of the optical section 230 exists within the central portion 230a. The central portion 230a is the central portion of the optical section 230 centered on the optical axis C2. The central portion 230a is also called the first central portion.

The central portion 230a is, for example, a convex lens. The central portion 230a collects light. The central portion 230a has an emission surface 233. The emission surface 233 has, for example, a convex shape. The convex structure of the emission surface 233 may be provided on the incident surface 231 side instead of the emission surface 233. The convex structure may be provided on the incident surface 231 side in addition to the emission surface 233.

The peripheral part 230b is another part of the optical part 230. That is, the peripheral portion 230b is a part of the optical unit 230 different from the central portion 230a. The peripheral portion 230b is formed on the outer peripheral side of the central portion 230a with the optical axis C2 as the center. The peripheral portion 230b is a portion inside the outer peripheral surface of the optical portion 230 and outside the central portion 230a. The peripheral portion 230b is also referred to as a first peripheral portion.

The peripheral portion 230b is, for example, a Fresnel lens. The peripheral portion 230b is, for example, a prism. The peripheral portion 230b collects light. The peripheral portion 230b includes an emission surface 232.

The emission surface 232 includes a plurality of prism shapes. The prism shape is, for example, an annular shape when viewed from the Z-axis direction. The plurality of prism shapes are arranged concentrically when viewed from the Z-axis direction. The optical unit 230 may have a prism shape on the incident surface 231. The optical unit 230 may have a Fresnel shape on the incident surface 231. Alternatively, the optical unit 230 may be a combination of a plurality of lenses having a prism shape. The optical unit 230 may be a combination of a plurality of lenses having a Fresnel shape.

<<3-2>> State of Illumination Function FIG. 11 shows a state in which the optical unit 230 of the projection device is in the initial position. FIG. 11 shows a case where the projection device is in the state of the illumination function. At this time, the distance P from the light source unit 1 to the optical unit 230 is P1. The position of the focal point F of the optical unit 230 is on the −Z axis direction side of the light source unit 1. The position of the focus F of the optical unit 230 is on the −Z axis direction side of the light emitting surface 11. The distance P1 from the optical section 230 to the light emitting surface 11 of the light source section 1 is shorter than the focal length f1 of the optical section 230. Here, the focal length f1 is the distance from the incident surface 231 of the optical unit 230 to the focus F.

In the state of the illumination function, the light R1 emitted from the light source unit 1 is refracted by the incident surface 231 of the optical unit 230. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 231. The light R1 deflected by the incident surface 231 passes through the optical unit 230. The light R2 that has passed through the optical unit 230 is emitted from the emission surfaces 232 and 233. The light R2 emitted from the emission surfaces 232 and 233 is divergent light.

The light R2a emitted from the central portion 230a travels toward the image forming area 31 of the image forming unit 3. The light R2a emitted from the central portion 230a enters the image forming area 31. The light R2a emitted from the emission surface 233 enters the image forming area 31. At this time, the light R2a passing through the image forming area 31 becomes image light.

The light R2b emitted from the peripheral portion 230b travels toward the peripheral region 32 of the image forming unit 3. The light R2b emitted from the emission surface 232 enters the peripheral region 32. The light R2b incident on the peripheral region 32 passes through the peripheral region 32 and becomes the illumination light 71.

<<3-3>> State of Projection Function FIG. 12 shows a state in which the optical unit 230 of the projection device is in a position different from the initial position. FIG. 12 shows a case where the projection device is in the projection function. At this time, the distance P from the light source unit 1 to the optical unit 230 is P2. The distance P2 is longer than the distance P1 (P2>P1). Further, the position of the focus F of the optical section 230 is between the light source section 1 and the optical section 230. The position of the focus F of the optical unit 230 is between the light emitting surface 11 of the light source unit 1 and the optical unit 230. The distance P2 from the optical section 230 to the light emitting surface 11 of the light source section 1 is longer than the focal length f1 of the optical section 230. In the state of the projection function, the optical unit 230 moves in the +Z axis direction as compared with the state of the illumination function.

In the case of the projection function state, the light R1 emitted from the light source unit 1 is refracted at the incident surface 231 of the optical unit 230. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 231. The light R1 deflected by the incident surface 231 passes through the optical unit 230. The light R2 that has passed through the optical unit 230 is emitted from the emission surfaces 232 and 233. The light R2 emitted from the emission surfaces 232 and 233 is convergent light.

The light R2c emitted from the central portion 230a travels toward the image forming area 31 of the image forming unit 3. The light R2c emitted from the central portion 230a enters the image forming area 31. The light R2c emitted from the emission surface 233 enters the image forming area 31. At this time, the light R2c passing through the image forming area 31 becomes image light.

The light R2d emitted from the peripheral portion 230b travels toward the image forming area 31 of the image forming unit 3. The light R2d emitted from the peripheral portion 230b enters the image forming area 31. The light R2d emitted from the emission surface 232 enters the image forming area 31. At this time, the light R2d passing through the image forming area 31 becomes image light.

As described above, according to the projection device according to the third embodiment, it is possible to switch between illumination light projection and image projection with a simple configuration.

Note that the projection apparatus according to the third embodiment is the same as the projection apparatus 100 according to the first embodiment or the projection apparatus according to the second embodiment, except for the points described above.

<<4>> Fourth Embodiment
FIG. 13 is a diagram showing a main configuration and a main path of light passing through the optical unit 240 in the state of the illumination function of the projection device according to the fourth embodiment of the present invention. FIG. 14 is a diagram showing a main configuration and a main path of light passing through the optical section 240 in a projection function state of the projection device according to the fourth embodiment. 13 and 14, components that are the same as or correspond to the components shown in FIGS. 9 and 10 are given the same reference numerals as those shown in FIGS. 9 and 10, and description thereof is omitted. The projection apparatus according to the fourth embodiment differs from the projection apparatus according to the second embodiment in the shape of the optical section 240. That is, the projection apparatus according to the fourth embodiment differs from the projection apparatus according to the second embodiment in that the optical section 240 includes the light blocking section 243.

<<4-1>> Configuration of Optical Unit 240 In the projection apparatus according to the fourth embodiment, the optical unit 240 has the same convex lens shape as the optical unit 220. Therefore, regarding the shape of the convex lens, the description of the optical unit 240 will be used instead of the description of the optical unit 220. The

components

240a, 240b, 241, 242 correspond to the

components

220a, 220b, 221, 222, respectively.

The optical section 240 includes a light shielding section 243 on the side of the emission surface 242. The central portion 240a includes a light shielding portion 243 on the side of the emission surface 242. The light shield 243 is a member that absorbs light. Alternatively, the light shield 243 is a member that reflects light.

The light blocking unit 243 has a function of reducing unnecessary light that enters the image forming area 31 in the state of the illumination function. That is, the light shielding unit 243 reduces the amount of unnecessary light in the state of the illumination function.

<<4-2>> State of Illumination Function FIG. 13 shows a state in which the optical unit 240 of the projection device is in the initial position. FIG. 13 shows a case where the projection device is in the illumination function. At this time, the distance P from the light source unit 1 to the optical unit 240 is P1. Further, the position of the focus F of the optical section 240 is on the −Z axis direction side of the light source section 1. The position of the focal point F of the optical unit 240 is on the −Z axis direction side of the light emitting surface 11. The distance P1 from the optical section 240 to the light emitting surface 11 of the light source section 1 is shorter than the focal length f1 of the optical section 240. Here, the focal length f1 is the distance from the incident surface 241 of the optical unit 240 to the focus F.

In the state of the illumination function, the light R1 emitted from the light source unit 1 is refracted by the incident surface 241 of the optical unit 240. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 241. The light R1 deflected by the incident surface 241 passes through the optical unit 240. The light R2 that has passed through the optical unit 240 is emitted from the emission surface 242. The light R2 emitted from the emission surface 242 is divergent light.

The light R1 incident on the central portion 240a passes through the central portion 240a and reaches the light shielding portion 243. The light R1 incident on the central portion 240a reaches the light blocking portion 243. The light R1 that reaches the light blocking portion 243 is blocked by the light blocking portion 243. The light R1 that reaches the light shield 243 is absorbed by the light shield 243. The light R1 that reaches the light shield 243 is reflected by the light shield 243. That is, the light R1a incident on the central portion 240a is not emitted from the central portion 240a toward the image forming unit 3. Therefore, in the case of the state of the illumination function, it is possible to reduce unnecessary light entering the image forming area 31.

The light R2b emitted from the peripheral portion 240b travels toward the peripheral region 32 of the image forming unit 3. The light R2b emitted from the emission surface 242 is incident on the peripheral region 32. The light R2b incident on the peripheral region 32 passes through the peripheral region 32 and becomes the illumination light 71.

<<4-3>> State of Projection Function FIG. 14 shows a state in which the optical unit 240 of the projection device is at a position different from the initial position. FIG. 14 shows a case where the projection device is in the projection function. At this time, the distance P from the light source unit 1 to the optical unit 240 is P2. The distance P2 is longer than the distance P1 (P2>P1). The position of the focus F of the optical section 240 is between the light source section 1 and the optical section 240. The position of the focal point F of the optical section 240 is between the light emitting surface 11 of the light source section 1 and the optical section 240. The distance P2 from the optical section 240 to the light emitting surface 11 of the light source section 1 is longer than the focal length f1 of the optical section 240. In the state of the projection function, the optical unit 240 is moved in the +Z axis direction as compared with the state of the illumination function.

In the case of the projection function state, the light R1 emitted from the light source unit 1 is refracted at the incident surface 241 of the optical unit 240. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 241. The light R1 deflected by the incident surface 241 passes through the optical unit 240. The light R2 that has passed through the optical unit 240 is emitted from the emission surface 242. The light R2 emitted from the emission surface 242 is convergent light.

The light R1 incident on the central portion 240a passes through the central portion 240a and reaches the light shielding portion 243. The light R1 incident on the central portion 240a reaches the light blocking portion 243. The light R1 that reaches the light blocking portion 243 is blocked by the light blocking portion 243. The light R1 that reaches the light shield 243 is absorbed by the light shield 243. The light R1 that reaches the light shield 243 is reflected by the light shield 243. That is, the light incident on the central portion 240a is not emitted from the central portion 240a toward the image forming unit 3.

The light R2d emitted from the peripheral portion 240b travels toward the image forming area 31 of the image forming unit 3. The light R2d emitted from the peripheral portion 240b enters the image forming area 31. The light R2d emitted from the emission surface 242 is incident on the image forming area 31. At this time, the light R2d passing through the image forming area 31 becomes image light.

As described above, the projection device according to the fourth embodiment can switch between illumination light projection and image projection with a simple configuration.

Further, the projection apparatus according to the fourth embodiment can reduce the light incident on the image forming area 31 in the case of the state of the illumination function, as shown in FIG. Therefore, it is possible to prevent the image 72 from being superimposed on the illumination light 71 in the state of the illumination function. In the state of the lighting function, the projection device is not intended to display the image 72.

Note that, except for the points described above, the projection apparatus according to the fourth embodiment is the same as the projection apparatus according to the first, second, or third embodiment. The light blocking portion 243 can be adopted in the optical portion 230 of the third embodiment.

<<5>> Embodiment 5
FIG. 15 is a diagram showing a main configuration and a main path of light passing through the optical unit 250 in the state of the illumination function of the projection device according to the fifth embodiment of the present invention. FIG. 16 is a diagram showing a main configuration and a main path of light passing through the optical unit 250 in a projection function state of the projection device according to the fifth embodiment. 15 and 16, the same or corresponding components as those shown in FIGS. 9 and 10 are designated by the same reference numerals as those shown in FIGS. 9 and 10, and the description thereof is omitted. The projection apparatus according to the fifth embodiment differs from the projection apparatus according to the second embodiment in the shape of the optical unit 250. That is, the projection apparatus according to the fifth embodiment differs from the projection apparatus according to the second embodiment in that the optical section 250 includes the light diverging section 253.

<<5-1>> Configuration of Optical Unit 250 In the projection device according to the fifth embodiment, the optical unit 250 has a convex lens shape similar to that of the optical unit 220. Therefore, regarding the shape of the convex lens, the description of the optical unit 220 will be used instead. The

constituent elements

250a, 250b, 251, 252 correspond to the

constituent elements

220a, 220b, 221, 222, respectively.

The optical unit 250 includes a light diverging unit 253. The central portion 250a includes a light diverging portion 253. The light diverging unit 253 increases the divergence angle of light. The light diverging portion 253 is provided on the emission surface 252 side. The light diverging section 253 may be provided on the incident surface 251 side. The light diverging portion 253 has a concave shape. The light diverging portion 253 has the shape of a concave lens. The peripheral portion 230b has the shape of a convex lens that collects light. That is, the peripheral portion 230b reduces the divergence angle of light.

The light diverging unit 253 has a function of reducing unnecessary light incident on the image forming area 31 in the state of the illumination function. That is, the light shielding unit 243 reduces the amount of unnecessary light in the state of the illumination function.

<<5-2>> State of Illumination Function FIG. 15 shows a state in which the optical unit 250 of the projection device is in the initial position. FIG. 15 shows a case where the projection device is in the state of the illumination function. At this time, the distance P from the light source unit 1 to the optical unit 250 is P1. Further, the position of the focus F of the optical section 250 is on the −Z axis direction side of the light source section 1. The position of the focal point F of the optical unit 250 is on the −Z axis direction side of the light emitting surface 11. The distance P1 from the optical section 250 to the light emitting surface 11 of the light source section 1 is shorter than the focal length f1 of the optical section 250. Here, the focal length f1 is the distance from the incident surface 251 of the optical unit 250 to the focus F.

In the state of the illumination function, the light R1 emitted from the light source unit 1 is refracted by the incident surface 251 of the optical unit 250. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 251. The light R1 deflected by the incident surface 251 passes through the optical unit 250. The light R2 transmitted through the optical section 250 is emitted from the emission surface 252 and the light diverging section 253.

The light R1 incident on the central portion 250a passes through the central portion 250a and reaches the light diverging portion 253. The light R1 incident on the central portion 250a reaches the light diverging portion 253. The light R1 that has reached the light diverging unit 253 is diverged by the light diverging unit 253. The light R2a is emitted from the light diverging unit 253. That is, the light R1a incident on the central portion 250a is emitted from the light diverging portion 253. The light R2 emitted from the light diverging unit 253 is divergent light.

The light R2a emitted from the central portion 250a travels toward the image forming area 31 and the peripheral area 32 of the image forming unit 3. That is, the light R2a emitted from the light diverging portion 253 enters the image forming area 31 and the peripheral area 32. At this time, the light R2a passes through the image forming area 31 and becomes image light. The light R2a passes through the peripheral region 32 and becomes the illumination light 71. Therefore, the light utilization efficiency of the illumination light 71 is improved. Further, the amount of light R2a incident on the image forming area 31 is smaller than that of the optical section 220. Therefore, the visibility of the image 72 projected on the target area 6 is lower than that of the optical unit 220.

The light R2b emitted from the peripheral portion 250b travels toward the peripheral region 32 of the image forming unit 3. The light R2b emitted from the emission surface 252 enters the peripheral region 32. The light R2b incident on the peripheral region 32 passes through the peripheral region 32 and becomes the illumination light 71.

<<5-3>> State of Projection Function FIG. 16 shows a state in which the optical unit 250 of the projection device is at a position different from the initial position. FIG. 16 shows a case where the projection apparatus is in the projection function state. At this time, the distance P from the light source unit 1 to the optical unit 250 is P2. The distance P2 is longer than the distance P1 (P2>P1). Further, the position of the focal point F of the optical section 250 is between the light source section 1 and the optical section 250. The position of the focus F of the optical section 250 is between the light emitting surface 11 of the light source section 1 and the optical section 250. The distance P2 from the optical section 250 to the light emitting surface 11 of the light source section 1 is longer than the focal length f1 of the optical section 250. In the projection function state, the optical unit 250 moves in the +Z-axis direction as compared with the illumination function state.

In the state of the projection function, the light R1 emitted from the light source unit 1 is refracted by the incident surface 251 of the optical unit 250. That is, the light R1 emitted from the light source unit 1 is deflected by the incident surface 251. The light R1 deflected by the incident surface 251 passes through the optical unit 250. The light R2 transmitted through the optical unit 250 is emitted from the emission surface 252. The light R2 emitted from the emission surface 252 is convergent light.

The light R1 incident on the central portion 250a passes through the central portion 250a and reaches the light diverging portion 253. The light R1a incident on the central portion 250a reaches the light diverging portion 253. The light R1 that has reached the light diverging unit 253 is diverged by the light diverging unit 253. The light R2c is emitted from the light diverging unit 253. The light R2 emitted from the light diverging unit 253 is divergent light.

The light R2c emitted from the central portion 250a travels toward the image forming area 31 and the peripheral area 32 of the image forming unit 3. That is, the light R2c emitted from the light diverging portion 253 enters the image forming area 31 and the peripheral area 32. At this time, the light R2c passes through the image forming area 31 and becomes image light. The light R2c passes through the peripheral region 32 and becomes the illumination light 71.

The light R2d emitted from the peripheral portion 250b travels toward the image forming area 31 of the image forming unit 3. The light R2d emitted from the peripheral portion 250b enters the image forming area 31. The light R2d emitted from the emission surface 252 enters the image forming area 31. At this time, the light R2d passing through the image forming area 31 becomes image light.

The shape of the light diverging portion 253 is shown as a concave shape. However, the light diverging portion 253 may have another shape as long as it has a configuration for diverging light. The light diverging portion 253 may be, for example, a light diffusing surface. The light diffusing surface of the light diverging portion 253 is, for example, a surface having a minute uneven shape on the emitting surface 252 side. Further, the light diverging portion 253 may be, for example, a light diffusion layer. The light diffusion layer contains, for example, light diffusion particles on the emission surface 252 side of the central portion 250a of the optical section 250. The central portion 250a contains light diffusing particles. The central portion 250a contains a large number of light diffusing particles. The light diffusion particles are scattered. The light diffusion particles are minute particles. The light diverging portion 253 includes a light diffusing surface or a light diffusing layer.

As described above, the projection device according to the fifth embodiment can switch between illumination light projection and image projection with a simple configuration.

Further, the projection apparatus according to the fifth embodiment can use the light R2a as the illumination light in the case of the state of the illumination function, as shown in FIG. Therefore, the light utilization efficiency can be improved. Further, the amount of light R2a incident on the image forming area 31 is smaller than that of the optical section 220. Therefore, the visibility of the image 72 projected on the target area 6 is lower than that of the optical unit 220.

Note that, except for the points described above, the projection apparatus according to the fifth embodiment is the same as the projection apparatus according to the first, second, third, or fourth embodiment. The light diverging section 253 can be adopted in the optical section 230 of the third embodiment.

<<6>> Modification 1 of Embodiments 1 to 5
FIG. 17 is a diagram showing a schematic cross-sectional structure of the optical unit 420 of the projection device according to the first modification of the first to fifth embodiments and a main path of light passing through the optical unit 420. FIG. 17 shows a sectional structure in which the optical section 420 is cut along a plane parallel to the YZ plane. The projection apparatus according to Modification 1 includes an optical section 420 shown in FIG. 17, instead of the optical section 4 in the first to fifth embodiments.

The optical section 420 includes a central portion 420a and a peripheral portion 420b.

The central portion 420a has an entrance surface 421 and an exit surface 422. The optical axis C4 of the optical section 420 passes through the central portion 420a. That is, the optical axis C4 of the optical section 420 exists within the central portion 420a. The central portion 420a is also called the second central portion. The optical unit 2 and the optical unit 420 may be arranged so that the optical axis C4 is located on the same axis as the optical axis C2. The optical unit 2 and the optical unit 420 may be arranged so that the optical axis C4 is inclined with respect to the optical axis C2. The optical unit 2 and the optical unit 420 may be arranged so that the optical axis C4 is eccentric with respect to the optical axis C2.

The central portion 420a is similar to the central portion 40a of the optical unit 4. The incident surface 421 corresponds to the incident surface 41. The emission surface 422 corresponds to the emission surface 44. The description of the central portion 420a is substituted by the description of the central portion 40a. The optical axis of the central portion 420a is the optical axis C4.

The image light R31 transmitted through the image forming area 31 enters the central portion 420a. The image light R31 incident on the central portion 420a is applied to the target area 6. The image light R31 emitted from the image forming area 31 is applied to the target area 6 as the image light R4c. The image light R4c is projected onto the target area 6. As a result, the image 72 is projected on the target area 6.

The peripheral part 420b is another part of the optical part 420. That is, the peripheral portion 420b is a part of the optical portion 420 different from the central portion 420a. The peripheral portion 420b includes a holding portion 423 and a reflector 424. The peripheral portion 420b is formed on the outer peripheral side of the central portion 420a with the optical axis C4 as the center. That is, the peripheral portion 420b is arranged radially outside the central portion 420a with the optical axis C4 as the center. The peripheral portion 420b is also referred to as a second peripheral portion. The optical axis of the peripheral portion 420b is the optical axis C4.

The central portion 420a and the peripheral portion 420b may be integrally formed of the same material. Further, the central portion 420a and the peripheral portion 420b may be formed of different members.

The holding portion 423 holds the central portion 420a. The holder 423 is held by the reflector 424. The holding portion 423 is preferably a transparent member.

The reflector 424 has a light reflecting surface. The light reflecting surface is formed inside the reflector 424. The reflector 424 reflects light. The reflector 424 is, for example, a concave mirror. The reflector 424 has a tubular shape. The inner surface (light reflecting surface) side of the reflector 424 has, for example, the shape of a side wall of a truncated cone. The inside of the optical unit 420 is hollow. "Hollow" means that the inside of an object is made up of a hollow material. The reflector 424 may be a structure in which a plurality of light reflecting members are combined. The light reflecting surface of the reflector 424 may have an aspherical shape. The optical axis of the reflector 424 is the optical axis C4.

The light applied to the peripheral area 32 of the image forming unit 3 passes through the peripheral area 32 and enters the peripheral portion 420b. The light incident on the peripheral portion 420b passes through the holding portion 423 and is irradiated on the target area 6. The holding unit 423 transmits the light R32 emitted from the peripheral region 32. The holding unit 423 transmits the light R32 reflected by the reflector 424. The light that has entered the peripheral portion 420b is reflected by the reflector 424 and is applied to the target region 6. The light R32 emitted from the peripheral region 32 is the light R4d. The light R4d is applied to the area of the illumination light 71 on the target area 6.

As described above, the projection device according to the first modification can project the illumination light 71 and the image 72 with a simple configuration.

<<7>> Modification 2 of Embodiments 1 to 5
FIG. 18 is a diagram showing a schematic cross-sectional structure of the optical unit 430 of the projection device according to the second modification of the first to fifth embodiments and a main path of light passing through the optical unit 430. FIG. 18 shows a sectional structure in which the optical section 430 is cut along a plane parallel to the YZ plane. The projection apparatus according to Modification 2 includes an optical section 430 shown in FIG. 18 instead of the optical section 4 in the first to fifth embodiments.

The optical unit 430 includes a central portion 430a and a peripheral portion 430b.

The central portion 430a has an entrance surface 431 and an exit surface 433. The optical axis C4 of the optical unit 430 passes through the central portion 430a. That is, the optical axis C4 of the optical unit 430 exists within the central portion 430a. The central portion 430a is also referred to as the second central portion. The optical unit 2 and the optical unit 430 may be arranged so that the optical axis C4 is located on the same axis as the optical axis C2. The optical unit 2 and the optical unit 430 may be arranged so that the optical axis C4 is inclined with respect to the optical axis C2. The optical unit 2 and the optical unit 430 may be arranged so that the optical axis C4 is eccentric with respect to the optical axis C2.

The central portion 430a is similar to the central portion 40a of the optical unit 4. The incident surface 431 corresponds to the incident surface 41. The emission surface 433 corresponds to the emission surface 44. The description of the central portion 430a is substituted by the description of the central portion 40a. The optical axis of the central portion 430a is the optical axis C4.

The image light R31 transmitted through the image forming area 31 is incident on the central portion 430a. The image light R31 incident on the central portion 430a is applied to the target region 6. The image light R31 emitted from the image forming area 31 is applied to the target area 6 as the image light R4e. The image light R4e is projected on the target area 6. As a result, the image 72 is projected on the target area 6.

The peripheral part 430b is another part of the optical part 430. That is, the peripheral portion 430b is a part of the optical unit 430 different from the central portion 430a. The peripheral portion 430b includes an entrance surface 432 and an exit surface 434. The peripheral portion 430b is formed on the outer peripheral side of the central portion 430a with the optical axis C4 as the center. That is, the peripheral portion 430b is arranged outside the central portion 430a in the radial direction with the optical axis C4 as the center. The peripheral portion 430b is also referred to as a second peripheral portion.

The peripheral portion 430b includes a lens. The peripheral portion 430b is formed of a lens. The peripheral portion 430b includes a convex lens. The peripheral portion 430b is formed of a convex lens. The peripheral portion 430b is formed of, for example, a plano-convex lens. The peripheral portion 430b may be formed of, for example, a biconvex lens. The optical axis of the peripheral portion 430b is the optical axis C4. In addition, the peripheral portion 430b may include a concave lens. The peripheral portion 430b may be formed of a concave lens. The light R32 that has entered the concave lens of the peripheral portion 430b is emitted as diverged light R4f.

The light applied to the peripheral area 32 of the image forming unit 3 passes through the peripheral area 32 and is incident on the peripheral portion 430b. The light incident on the peripheral portion 430b is refracted to become the light R4f. The light R4f is directed to the target area 6. The light R4f is projected as the illumination light 71 on the target area 6.

The central portion 430a and the peripheral portion 430b are integrally formed of the same material. However, the central portion 430a and the peripheral portion 430b may be formed of different members. The optical unit 430 may be formed by combining a plurality of lenses.

As described above, the projection device according to the second modification can project the illumination light 71 and the image 72 with a simple configuration.

<<8>> Modification 3 of Embodiments 1 to 5
FIG. 19 is a diagram showing a schematic cross-sectional structure of an optical unit 440 and a main path of light passing through the optical unit 440 of the projection device according to the third modification of the first to fifth embodiments. FIG. 19 shows a sectional structure of the optical section 440 cut along a plane parallel to the YZ plane. The projection apparatus according to Modification 3 includes an optical section 440 shown in FIG. 19 instead of the optical section 4 in the first to fifth embodiments.

The optical unit 440 includes a central portion 440a and a peripheral portion 440b.

The central portion 440a has an entrance surface 441 and an exit surface 443. The optical axis C4 of the optical section 440 passes through the central portion 440a. That is, the optical axis C4 of the optical unit 440 exists within the central portion 440a. Central portion 440a is also referred to as the second central portion. The optical unit 2 and the optical unit 440 may be arranged so that the optical axis C4 is located on the same axis as the optical axis C2. The optical unit 2 and the optical unit 440 may be arranged so that the optical axis C4 is inclined with respect to the optical axis C2. The optical unit 2 and the optical unit 440 may be arranged so that the optical axis C4 is eccentric with respect to the optical axis C2.

The central portion 440a is similar to the central portion 40a of the optical unit 4. The incident surface 441 corresponds to the incident surface 41. The emission surface 443 corresponds to the emission surface 44. The description of the central portion 440a is substituted by the description of the central portion 40a. The optical axis of the central portion 440a is the optical axis C4.

The image light R31 transmitted through the image forming area 31 is incident on the central portion 440a. The image light R31 incident on the central portion 440a is applied to the target area 6. The image light R31 emitted from the image forming area 31 is applied to the target area 6 as the image light R4g. The image light R4g is projected on the target area 6. As a result, the image 72 is projected on the target area 6.

The peripheral part 440b is another part of the optical part 440. That is, the peripheral portion 440b is a part of the optical unit 440 different from the central portion 440a. The peripheral portion 440b includes an entrance surface 442 and an exit surface 444. The peripheral portion 440b is formed on the outer peripheral side of the central portion 440a with the optical axis C4 as the center. That is, the peripheral portion 440b is arranged outside the center portion 440a in the radial direction around the optical axis C4. The peripheral portion 440b is also referred to as a second peripheral portion.

The peripheral portion 440b includes, for example, a Fresnel lens. The peripheral portion 440b is, for example, a Fresnel lens. The peripheral portion 440b is formed of a Fresnel lens. The peripheral portion 440b has a Fresnel lens shape. In addition, the peripheral portion 440b may include a Fresnel lens shape in a partial area. Here, the partial region is, for example, a region around the peripheral portion 440b.

The peripheral portion 440b is formed of a Fresnel-shaped convex lens. The peripheral portion 440b is formed of, for example, a Fresnel-shaped plano-convex lens. The peripheral portion 440b may be formed of, for example, a Fresnel-shaped biconvex lens. Further, similar to the optical unit 430, the peripheral portion 440b may include a concave lens.

The emission surface 444 includes a Fresnel shape. The Fresnel shape is, for example, an annular shape when viewed from the Z-axis direction. The Fresnel shapes are arranged concentrically when viewed from the Z-axis direction. The peripheral portion 440b may have a Fresnel shape on the incident surface 442. Alternatively, the peripheral portion 440b may be a combination of a plurality of lenses having a Fresnel shape.

Further, the peripheral portion 440b may include, for example, a prism having two flat surfaces. The peripheral portion 440b is, for example, a prism. The peripheral portion 440b is formed of a prism. The peripheral portion 440b has a prism shape. The peripheral portion 440b includes a plurality of prisms. In the peripheral portion 440b, the lens surface of the Fresnel-shaped lens is formed as a flat surface. In addition, the peripheral portion 440b may include a prism shape in a part of the area. Here, the partial region is, for example, a region around the peripheral portion 440b.

The emitting surface 444 includes a plurality of prism shapes. The prism shape is, for example, an annular shape when viewed from the Z-axis direction. The plurality of prism shapes are arranged concentrically when viewed from the Z-axis direction. The incident surface 442 of the peripheral portion 440b may have a prism shape. Alternatively, the peripheral portion 440b may be a combination of a plurality of lenses having a prism shape.

For example, the peripheral portion 440b has the same performance as the peripheral portion 430b. The peripheral portion 440b collects light.

The light applied to the peripheral area 32 of the image forming unit 3 passes through the peripheral area 32 and enters the peripheral portion 440b. The light incident on the peripheral portion 440b is refracted to become the light R4h. The light R4h is directed to the target area 6. The light R4h is projected onto the target area 6 as the illumination light 71.

The central portion 440a and the peripheral portion 440b are integrally formed of the same material. However, the central portion 440a and the peripheral portion 440b may be formed of different members. The optical unit 440 may be formed by combining a plurality of lenses.

As described above, the projection device according to the third modification can project the illumination light 71 and the image 72 with a simple configuration.

<<9>> Other Modifications The projection devices according to the first to fifth embodiments and their modifications 1 to 3 are merely examples, and various modifications can be made within the scope of the present invention. The present invention is not limited to these embodiments.

In the present application, the terms such as “parallel”, “vertical”, “center”, and the like, the positions of the parts, the positional relationship between the parts, or the terms indicating the shapes of the parts are defined by manufacturing tolerances and assembly ranges. This is a range that takes into consideration variations and the like. For this reason, in the present application, terms such as “parallel”, “vertical”, “center”, etc., indicating the position of parts, the positional relationship between parts, or the shape of parts are used without describing “substantially”. When used, the ranges indicated by these terms mean a range that takes into consideration manufacturing tolerances, assembly variations, and the like.

Based on each of the above embodiments, the contents of the invention will be described below as appendices (1) to (3). The reference numerals (1) to (3) are independently assigned. Therefore, for example, “Supplementary Note 1” exists in each of Supplementary Note (1) to Supplementary Note (3).

Also, the features of Appendix (1), the features of Appendix (2), and the features of Appendix (3) can be combined.

<<Appendix (1)>>
<<Appendix 1>>
A light source section that emits light,
A first optical unit that receives and collects the light emitted from the light source unit;
An image forming section including an image forming area for converting the light condensed by the first optical section into image light;
A second optical unit for projecting the image light,
The first optical unit is located at a first central portion including a first optical axis of the first optical unit and a first central portion around the first optical axis. Including the periphery of
The condensed light is light emitted from the first peripheral portion,
A projection device in which the condensed light is irradiated to the image forming area or a peripheral area around the image forming area by changing a condensing position of the light emitted from the first optical unit.

<<Appendix 2>>
The projection device according to appendix 1, wherein the condensing position is changed by changing a distance from the light source unit to the first optical unit.

<<Appendix 3>>
The projection device according to

appendix

1 or 2, wherein the light with which the peripheral region is irradiated is condensed between the first optical unit and the image forming unit.

<<Appendix 4>>
The first optical unit includes an incident surface that deflects light incident on the first central portion by refraction in a peripheral direction, and has a reflection surface that collects light incident on the first peripheral portion by reflection. The projection device according to

supplementary note

1 or 2.

<Appendix 5>
The projection device according to attachment 4, wherein the light deflected by the incident surface reaches the reflection surface.

<Appendix 6>
3. The projection device according to

appendix

1 or 2, wherein the first optical unit includes a lens surface that collects the light incident on the first peripheral portion by refraction.

<Appendix 7>
3. The projection device according to

appendix

1 or 2, wherein the first optical unit includes a prism surface that collects light incident on the first peripheral portion by refraction.

<Appendix 8>
8. The projection device according to appendix 6 or 7, wherein the first optical unit includes a light blocking unit that blocks light that has entered the first central portion.

<Appendix 9>
8. The projection device according to appendix 6 or 7, wherein the first optical unit includes a light diverging unit that diverges light that has entered the first central portion.

<Appendix 10>
The projection device according to attachment 9, wherein the light diverging portion is a concave lens.

<<Appendix 11>>
10. The projection device according to attachment 9, wherein the light diverging unit is a diffusion unit that diffuses incident light.

<Appendix 12>
The second optical unit is located at a second central portion through which a second optical axis of the second optical unit passes and a second optical unit located around the second central portion around the second optical axis. Including the periphery of
The projection device according to any one of appendices 1 to 11, wherein the second center portion projects the image light.

<<Appendix 13>>
The projection device according to attachment 12, wherein the second central portion is a convex lens.

<Appendix 14>
The projection device according to appendix 12 or 13, wherein the light emitted to the peripheral area is incident on the second peripheral portion and projected.

<Appendix 15>
15. The projection device according to any one of appendices 12 to 14, wherein the second peripheral portion is a reflector that reflects incident light.

<Appendix 16>
15. The projection device according to any one of appendices 12 to 14, wherein the second peripheral portion is a lens that refracts incident light.

<Appendix 17>
15. The projection device according to any one of appendices 12 to 14, wherein the second peripheral portion is a prism that refracts incident light.

<Appendix 18>
The projection device according to any one of appendices 1 to 17, wherein the image forming region is a liquid crystal element.

<<Appendix 19>>
18. The projection device according to any one of appendices 1 to 17, wherein image information is formed by a transmissive region and a light-shielded region in the image forming region.

<<Appendix 20>>
The projection device according to any one of appendices 1 to 19, wherein the peripheral region transmits light.

<<Appendix (2)>>
<<Appendix 1>>
A light source unit that emits first light;
A first optical unit that converts the first light into second light including a light component that converges or diverges;
An image forming section including an image forming area on which an image is formed, wherein the second light is incident on the image forming area and a peripheral area outside the image forming area;
A second optical unit that projects image light that is the second light that has passed through the image forming region and illumination light that is the second light that has passed through the peripheral region onto a target region;
A change unit that changes the traveling direction of the second light emitted from the first optical unit;
Equipped with
A projection device in which an amount of the second light incident on the image forming region and an amount of the second light incident on the peripheral region are changed by changing the traveling direction of the second light.

<<Appendix 2>>
The projection device according to appendix 1, wherein the changing unit changes a distance from the light source unit to the first optical unit.

<<Appendix 3>>
The amount of the second light incident on the image forming area when the distance is the first distance is equal to the image forming area when the distance is a second distance that is longer than the first distance. 3. The projection device according to attachment 2, which is smaller than the amount of the second light that is incident.

<<Appendix 4>>
The amount of the second light incident on the peripheral area when the distance is the first distance is incident on the peripheral area when the distance is the second distance that is longer than the first distance. The projection device according to

appendix

2 or 3, wherein the projection light amount is larger than the second light amount.

<Appendix 5>
5. The projection device according to any one of appendices 1 to 4, wherein the changing unit includes a supporting unit that movably supports at least one of the light source unit and the first optical unit.

<Appendix 6>
6. The projection device according to appendix 5, wherein the changing unit includes a drive unit that moves at least one of the light source unit and the first optical unit.

<Appendix 7>
The second light passing through the peripheral region includes the light that is incident on the peripheral region after being condensed between the first optical unit and the image forming unit. Projection device according to item 1.

<Appendix 8>
The first optical portion includes a first central portion where the optical axis of the first optical portion is present, and a first peripheral portion outside the first central portion,
The first central portion includes an incident surface that deflects incident light toward the periphery,
The projection device according to any one of appendices 1 to 7, wherein the first peripheral portion includes a light reflecting surface that collects the incident light by reflecting the incident light.

<Appendix 9>
The projection device according to attachment 8, wherein the light deflected by the incident surface reaches the light reflecting surface.

<Appendix 10>
10. The projection device according to appendix 8 or 9, wherein the first optical unit includes a lens unit that collects the incident light by refracting the light incident on the first peripheral portion.

<<Appendix 11>>
10. The projection device according to appendix 8 or 9, wherein the first optical unit includes a prism unit that collects the incident light by refracting the light incident on the first peripheral portion.

<Appendix 12>
The first optical portion includes a first central portion where the optical axis of the first optical portion is present, and a first peripheral portion outside the first central portion,
The projection device according to any one of appendices 1 to 7, wherein the first optical unit includes a light blocking unit that blocks light that has entered the first central portion.

<<Appendix 13>>
The first optical portion includes a first central portion where the optical axis of the first optical portion is present, and a first peripheral portion outside the first central portion,
8. The projection device according to any one of appendices 1 to 7, wherein the first optical unit includes a light diverging unit that diverges the light incident on the first central portion.

<Appendix 14>
14. The projection device according to appendix 13, wherein the light diverging portion is a concave lens or a diffusion portion that diffuses incident light.

<Appendix 15>
The second optical portion is located outside the second central portion around the second central portion where the optical axis of the second optical portion exists and the optical axis of the second optical portion. Including a second peripheral portion,
15. The projection device according to any one of appendices 1 to 14, wherein the second central portion projects the image light.

<Appendix 16>
The projection device according to attachment 15, wherein the second central portion is a convex lens.

<Appendix 17>
17. The projection device according to appendix 15 or 16, wherein the light emitted to the peripheral area is incident on the second peripheral portion and projected.

<Appendix 18>
The projection device according to any one of appendices 15 to 17, wherein the second peripheral portion includes a reflector that reflects incident light.

<<Appendix 19>>
The projection device according to any one of appendices 15 to 17, wherein the second peripheral portion includes a lens portion that refracts incident light.

<<Appendix 20>>
The projection apparatus according to any one of appendices 15 to 17, wherein the second peripheral portion includes a prism portion that refracts incident light.

<<Appendix 21>>
21. The projection device according to any one of appendices 1 to 20, wherein the image forming area is a device that displays an image based on image information.

<<Appendix 22>>
22. The projection device according to attachment 21, wherein the image forming region is a liquid crystal element.

<<Appendix (3)>>
<<Appendix 1>>
A light source unit that emits a first light;
A first optical unit that receives the first light, changes the light distribution of the first light, and emits the second light as second light;
An image forming unit including an image forming region that receives the second light and converts it into image light and emits the image light, and a peripheral region that receives the second light and emits it as illumination light.
A second optical unit that projects the image light to form a projected image,
A projection device that changes the ratio of the amount of the second light incident on the image forming area and the amount of the second light incident on the peripheral area by changing the light distribution.

<<Appendix 2>>
The light distribution is changed by changing the distance from the light source unit to the first optical unit,
The projection device according to attachment 1, wherein the distance includes a first distance and a second distance that is longer than the first distance.

<<Appendix 3>>
The amount of the second light incident on the image forming area when the distance is the first distance is equal to the second amount of light incident on the image forming area when the distance is the second distance. The projection device according to attachment 2, which is less than the amount of light.

<<Appendix 4>>
The amount of the second light incident on the peripheral region when the distance is the first distance is equal to the amount of the second light incident on the peripheral region when the distance is the second distance. The projection device according to

appendix

2 or 3, which is larger than the amount of

<Appendix 5>
5. The projection device according to any one of appendices 2 to 4, comprising a changing unit that changes the distance.

<Appendix 6>
The projection device according to appendix 5, wherein the changing unit moves at least one of the light source unit and the first optical unit.

<Appendix 7>
7. The projection device according to

appendix

5 or 6, further comprising a movement control unit that controls the changing unit.

<Appendix 8>
The first optical part is located outside the first central part with a first central part through which the first optical axis of the first optical part passes and the first optical part as a center. 8. The projection device according to any one of appendices 2 to 7, further comprising:

<Appendix 9>
The first central portion includes an incident surface that deflects the incident first light toward a first peripheral portion,
The projection apparatus according to appendix 8, wherein the first peripheral portion includes a reflecting surface that reflects the deflected first light.

<Appendix 10>
10. The projection device according to attachment 9, wherein the reflective surface reflects the first light in a direction in which the first light approaches the first optical axis.

<<Appendix 11>>
When the distance is a first distance, the first light reflected by the reflecting surface is located on the side opposite to the reflected reflecting surface with respect to the first optical axis. The projection device according to supplementary note 9 or 10, which reaches the peripheral region.

<Appendix 12>
When the distance is the first distance, the second light incident on the peripheral region includes the light condensed between the first optical unit and the image forming unit. 11. The projection device according to any one of 11.

<<Appendix 13>>
The projection device according to attachment 8, wherein the first optical unit includes a convex lens.

<Appendix 14>
If the distance is a first distance,
14. The projection device according to attachment 13, wherein the distance from the focal point of the convex lens to the first optical unit is longer than the first distance.

<Appendix 15>
If the distance is a second distance,
15. The projection device according to appendix 13 or 14, wherein the distance from the focal point of the convex lens to the first optical unit is shorter than the second distance.

<Appendix 16>
If the distance is a second distance,
The projection device according to any one of appendices 13 to 15, wherein the focal point of the convex lens is located between the light source unit and the first optical unit.

<Appendix 17>
The projection device according to any one of appendices 13 to 16, wherein the first central portion includes the convex lens.

<Appendix 18>
The projection device according to any one of appendices 13 to 17, wherein the first peripheral portion includes the convex lens.

<<Appendix 19>>
19. The projection device according to attachment 18, wherein the convex lens of the first peripheral portion includes a Fresnel shape.

<<Appendix 20>>
20. The projection device according to Note 19, wherein the Fresnel-shaped prism has a planar shape in which a lens surface is parallel to a plane in contact with the lens surface.

<<Appendix 21>>
21. The projection device according to any one of appendices 13 to 20, wherein the first central portion includes a light blocking portion that blocks the incident first light.

<<Appendix 22>>
21. The projection device according to any one of appendices 13 to 20, wherein the first central portion includes a light diverging portion that diverges the incident first light.

<Appendix 23>
23. The projection device according to attachment 22, wherein the light diverging portion is a concave lens.

<<Appendix 24>>
23. The projection device according to attachment 22, wherein the light diverging unit includes a light diffusing surface or a light diffusing layer that diffuses the incident first light.

<Appendix 25>
The first optical part is located outside the first central part with a first central part through which the first optical axis of the first optical part passes and the first optical part as a center. 1. The projection apparatus according to appendix 1, further comprising:

<Appendix 26>
The first central portion includes an incident surface that deflects the incident first light toward a first peripheral portion,
The projection device according to appendix 25, wherein the first peripheral portion includes a reflecting surface that reflects the deflected first light.

<Appendix 27>
27. The projection device according to appendix 26, wherein the reflecting surface reflects the first light in a direction in which the first light approaches the first optical axis.

<Appendix 28>
26. The projection device according to attachment 25, wherein the first optical unit includes a convex lens.

<Appendix 29>
29. The projection device according to attachment 28, wherein the first central portion includes the convex lens.

<Appendix 30>
30. The projection device according to attachment 28 or 29, wherein the first peripheral portion includes the convex lens.

<<Appendix 31>>
31. The projection device according to attachment 30, wherein the convex lens of the first peripheral portion includes a Fresnel shape.

<Appendix 32>
32. The projection device according to attachment 31, wherein the Fresnel-shaped prism has a planar shape in which a lens surface is parallel to a plane in contact with the lens surface.

<Appendix 33>
33. The projection device according to any one of appendices 28 to 32, wherein the first central portion includes a light blocking portion that blocks the incident first light.

<Appendix 34>
33. The projection device according to any one of appendices 28 to 32, wherein the first central portion includes a light diverging portion that diverges the incident first light.

<Appendix 35>
The projection device according to attachment 34, wherein the light diverging portion is a concave lens.

<Appendix 36>
35. The projection device according to attachment 34, wherein the light diverging portion includes a light diffusing surface or a light diffusing layer that diffuses the incident first light.

<Appendix 37>
The second optical portion is located outside the second central portion around the second central portion through which the second optical axis of the second optical portion passes and the second optical axis. Including the peripheral part of 2,
37. The projection device according to any one of appendices 1 to 36, wherein the second central portion projects the image light.

<Appendix 38>
38. The projection device according to attachment 37, wherein the second central portion includes a convex lens.

<Appendix 39>
39. The projection device according to appendix 37 or 38, wherein the second peripheral portion receives the illumination light emitted from the peripheral region and projects the illumination light.

<Appendix 40>
40. The projection device according to any one of appendices 37 to 39, wherein the second peripheral portion includes a reflecting surface that reflects the incident illumination light.

<<Appendix 41>>
40. The projection device according to any one of appendices 37 to 39, wherein the second peripheral portion includes a lens that refracts the incident illumination light.

<Appendix 42>
42. The projection device according to attachment 41, wherein the lens includes a convex lens.

<Appendix 43>
42. The projection device according to attachment 41, wherein the lens includes a concave lens.

<Appendix 44>
The projection device according to any one of appendices 41 to 43, wherein the lens includes a Fresnel shape.

<Appendix 45>
The projection device according to attachment 44, wherein the Fresnel-shaped prism has a planar shape in which a lens surface is parallel to a plane in contact with the lens surface.

<Appendix 46>
46. The projection device according to any one of appendices 1 to 45, wherein the peripheral area is located on the peripheral side of the image forming area.

<Appendix 47>
47. The projection device according to any one of appendices 1 to 46, wherein the image forming region forms an image by transmitting and blocking the second light.

<Appendix 48>
48. The projection device according to any one of appendices 1 to 47, wherein the image forming area is a liquid crystal element.

<Appendix 49>
The projection device according to any one of appendices 1 to 47, wherein the image forming region is a light shielding plate including an opening.

<Appendix 50>
The projection device according to any one of appendices 1 to 47, wherein the image forming region is a display element using a micromirror.

<Appendix 51>
The projection device according to any one of appendices 1 to 50, wherein the light distribution is a divergence angle of the second light.

<Appendix 52>
52. The projection device according to any one of appendices 1 to 51, which changes a ratio between the amount of the image light and the amount of the illumination light by changing the light distribution.

<Appendix 53>
53. The projection device according to any one of appendices 1 to 52, wherein the image light and the illumination light are applied to the same target area.

<Appendix 54>
54. The projection device according to any one of appendices 1 to 53, wherein at least one of the light source unit and the first optical unit moves in a direction parallel to the optical axis of the light source unit.

<Appendix 55>
54. The projection device according to any one of appendices 1 to 53, wherein at least one of the light source unit and the first optical unit moves in a direction parallel to the optical axis of the first optical unit.

1 light source, 11 light emitting surface, 2, 220, 230, 240, 250 optical part, 20a, 220a, 230a, 240a, 250a central part (first central part), 20b, 220b, 230b, 240b, 250b peripheral part ( (First peripheral portion), 21, 21a, 21b, 221, 231, 241, 251 incident surface, 22 reflection surface, 23, 24, 25, 222, 232, 233, 242, 252 emission surface, 243 light-shielding portion, 253 Light diverging section, 3 image forming section, 31 image forming area, 32 peripheral area, 33 image, 4,420, 430, 440 optical section, 40a, 420a, 430a, 440a central part (second central part), 40b, 420b, 430b, 440b peripheral part (second peripheral part), 423 holding part, 424 reflector, 41, 42, 421, 431, 432, 441, 442 incident surface, 43 reflective surface, 44, 45, 422, 433. 434, 443, 444 emission surface, 46 connection surface, 5 moving part (change part), 6 target area, 71 illumination light, 72 image, 100 projection device, C1 light source optical axis, C2 first optical part light Axis, the optical axis of the C4 second optical section.

Claims

A light source unit that emits a first light;
A first optical unit that receives the first light, changes the light distribution of the first light, and emits the second light as second light;
An image forming unit including an image forming region that receives the second light and converts it into image light and emits the image light, and a peripheral region that receives the second light and emits it as illumination light.
A second optical unit that projects the image light to form a projected image,
A projection device that changes the ratio of the amount of the second light incident on the image forming area and the amount of the second light incident on the peripheral area by changing the light distribution.
The light distribution is changed by changing the distance from the light source unit to the first optical unit,
The projection device according to claim 1, wherein the distance includes a first distance and a second distance that is longer than the first distance.
The amount of the second light incident on the image forming area when the distance is the first distance is equal to the second amount of light incident on the image forming area when the distance is the second distance. The projection device according to claim 2, wherein the amount of light is less than that of the projection device.
The first optical part is located outside the first central part with a first central part through which the first optical axis of the first optical part passes and the first optical part as a center. 1. The projection device according to claim 1, comprising one peripheral portion.
The first central portion includes an incident surface that deflects the incident first light toward a first peripheral portion,
The projection device according to claim 4, wherein the first peripheral portion includes a reflecting surface that reflects the deflected first light.
The projection device according to claim 4, wherein the first optical unit includes a convex lens.
The projection device according to claim 6, wherein the first central portion includes the convex lens.
The projection device according to claim 6 or 7, wherein the first peripheral portion includes the convex lens.
The second optical portion is located outside the second central portion around the second central portion through which the second optical axis of the second optical portion passes and the second optical axis. Including the peripheral part of 2,
The projection device according to claim 1, wherein the second central portion projects the image light.
The projection device according to any one of claims 1 to 9, wherein the peripheral area is located on the peripheral side of the image forming area.