JP5434342B2 - Electronics - Google Patents

Description

The present invention relates to an electronic device .

  Conventionally, there is a technique for suppressing color unevenness by forming a chromaticity conversion filter on a lens surface of a light source and partially converting chromaticity of light emitted from a light emitting unit (see, for example, Patent Document 1).

JP 2006-286906 A

  However, since the chromaticity conversion filter is formed on the lens surface of the light source, there may be a case where the color unevenness cannot be sufficiently reduced when the installation position of the lens with respect to the light source is shifted.

An object of the present invention is to provide an electronic apparatus that can favorably reduce color unevenness.

The electronic apparatus according to the present invention is a light source and a condensing lens that collimates light emitted from the light source, and an incident surface on which the light emitted from the light source is incident and an opposite side of the incident surface A condensing lens formed with a predetermined shape on a part of the incident surface, which is a surface with a small curvature, and a color filter that adjusts the chromaticity of light emitted from the light source; A projector module having a diffusion plate having an area larger than that of the color filter and adjusting a chromaticity of parallel light emitted from the condenser lens; and an imaging unit having an imaging device for imaging a subject. Have.

  According to the present invention, it is possible to satisfactorily reduce color unevenness by forming a filter in the condensing optical system.

It is a perspective view which shows the external appearance of the camera which concerns on embodiment. It is a front view which shows the structure inside the camera which concerns on embodiment. It is sectional drawing which shows the structure inside the projector module which concerns on embodiment. It is the elements on larger scale which show the structure inside the projector module which concerns on embodiment. It is the front view and side view of a condensing lens concerning an embodiment. It is the front view and side view of a condensing lens concerning an embodiment. It is the front view and side view of PS converter which concern on embodiment.

  A camera as an electronic apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an appearance of a camera 2 according to the embodiment. The camera 2 includes a housing 4 made of metal. On the front surface of the housing 4, an imaging window 6 of an imaging unit 18 (see FIG. 2) built in the housing 4 and a projector module built in the housing 4. There are provided 20 projection windows 8 (see FIG. 2) and a flash window 10 through which flash light is emitted during photographing. On the top surface of the camera 2, a power switch 12, a shutter button 14 for instructing a release operation, and a mode switching button 16 for switching between an imaging mode for imaging a subject and a projection mode for projecting an image are provided.

  FIG. 2 is a front view showing the arrangement of the units housed in the camera 2 according to the embodiment. Inside the camera 2, power is supplied to the imaging unit 18 having an imaging device for imaging a subject, the projector module 20 having a projection optical system for projecting an image, the imaging unit 18 and the projector module 20. A battery chamber 22 that houses a battery is provided.

  FIG. 3 is a cross-sectional view showing an internal configuration of the projector module 20 according to the embodiment, and FIG. 4 is an enlarged view of a portion B shown in FIG. The projection light emitted from the LED 32 supported by the LED holder 30 is adjusted to a predetermined chromaticity by the color filter 24a ′ formed on the surface on which the projection light of the condenser lens 24a is incident, and the condenser lenses 24a and 24b. After being converted into parallel light by the condenser lens group 24 including the light, the light enters the PS converter 46. Here, the PS converter 46 is an optical element that converts light into specific polarized light without reducing the amount of incident light, and is provided in the glass prism at an angle of 45 ° with respect to the traveling direction of the incident light. It has a polarization separation film 46a that transmits only specific polarized light, and a reflection film 46b provided in parallel to the polarization separation film 46a. Note that all the projection light that has passed through the condenser lens group 24 and entered the PS converter 46 enters the polarization separation film 46a. Further, a diffusion plate 47 that scatters and diffuses the light emitted from the PS converter 46 is provided on the surface from which the light of the PS converter 46 is emitted. A half-wave plate 49 is provided at a position where only the light transmitted through the polarization separation film 46a between the diffusion plate 47 and the PBS (polarization beam splitter) 48 is transmitted. Accordingly, the projection light transmitted through the PS converter 46 is converted into either P-polarized light or S-polarized light without causing a loss of light amount, and after the chromaticity is adjusted by the diffusion plate 47, it is applied to the PBS 48. Incident.

  For example, when the polarization separation film 46a transmits only P-polarized light, only S-polarized light is incident on the PBS 48, and the polarization separation provided in the PBS 48 at an angle of 45 ° with respect to the traveling direction of the incident light. The light enters the film 48a. Since the projection light incident on the polarization separation film 48a is only S-polarized light, it is reflected by the polarization separation film 28a, emitted downward from the lower surface 48b of the PBS 48, and then as an image display unit installed below the PBS 48. Is incident on the LCOS (reflection type liquid crystal element) 50.

  The light incident on the LCOS 50 is reflected by the LCOS 50 and is incident on the PBS 48 again. Here, a liquid crystal layer (not shown) constituting the LCOS 50 functions as a phase plate for incident light when a voltage is applied. Therefore, of the light emitted from the LCOS 50, the light transmitted through the pixel region to which a voltage is applied by the liquid crystal layer is converted from S-polarized light to P-polarized light. On the other hand, of the light emitted from the LCOS 50, the light transmitted through the pixel region to which no voltage is applied by the liquid crystal layer proceeds as S-polarized light.

  Of the light incident on the PBS 48 again as mixed light of P-polarized light and S-polarized light, only P-polarized light that has passed through the pixel region to which the voltage of the LCOS 50 has been applied passes through the polarization separation film 48a and is separated from the S-polarized light. The The P-polarized light is emitted upward from the PBS 48, and then a projection lens group 52 for projecting a projection optical image, and a mirror for deflecting the projection direction of the optical image emitted from the projection lens group 52. Projection is performed from the projector module 20 via 54. That is, the image displayed on the LCOS 50 is read as a projection optical image and projected in the forward direction of the camera 2.

FIG. 5A is a side view of the condenser lens 24a, and FIG. 5B is a front view of the condenser lens 24a viewed from the LED 32 side. As shown in FIGS. 5A and 5B, the color filter 24a ′ has a substantially rhombus shape in order to reduce color unevenness of the entire projected image. The color filter 24a ′ is formed by depositing a thin film having a function of converting chromaticity of transmitted light on the surface of the condenser lens 24a on which the projection light is incident. Here, by forming the color filter 24a ′ on the incident surface of the projection light of the condenser lens 24a, that is, the surface having a small curvature , it becomes easy to form the color filter 24a ′ with a uniform film thickness.

  When an image is projected using the camera 2, the operator operates the power switch 12 to turn on the power. When the operator operates the mode switching button 16 to set the projection mode, projection light is emitted from the LED 32. The projection light emitted from the LED 32 is adjusted to a predetermined chromaticity of the projection light passing through the color filter 24a ′ and is incident on the condenser lens 24a. The projection light is converted into parallel light by the condenser lens group 24, and then enters the PS converter 46, and then enters the polarization separation film 46a. Further, the projection light emitted from the PS converter 46 is adjusted in chromaticity by the diffusion plate 47, passes through the half-wave plate 49, enters the PBS 48, and enters the LCOS 50. Then, the light incident on the LCOS 50 is incident on the PBS 48 again, and an image displayed on the LCOS 50 is projected from the module housing 26 via the mirror 54.

  According to the projector module according to this embodiment, the color filter having a predetermined shape for adjusting the chromaticity of the projection light emitted from the LED is formed in the condenser lens group, and thus the image to be projected Overall color unevenness can be reduced well.

  In the above-described embodiment, the color filter 24a ′ and the diffusion plate 47 are used to adjust the chromaticity of the projection light. However, only the color filter 24a ′ or only the diffusion plate 47 is used. May be.

  In the above-described embodiment, the color filter 24a ′ is provided in the condenser lens 24a in order to adjust the chromaticity of the projection light. However, the color filter 24a ′ may be provided in the condenser lens 24b. Here, FIG. 6A is a front view of the condenser lens 24b viewed from the PS converter 46 side, and FIG. 6B is a side view of the condenser lens 24b. As shown in FIGS. 6A and 6B, the color filter 24b ′ has an elliptical shape in order to reduce color unevenness of the entire projected image. The color filter 24b 'is formed by depositing a thin film having a function of converting chromaticity of transmitted light on the surface of the condenser lens 24b from which projection light is emitted.

  In the above-described embodiment, the color filter 24 a ′ is provided in the condenser lens 24 a in order to adjust the chromaticity of the projection light, but it may be provided in the PS converter 46. 7A is a side view of the PS converter 46, and FIG. 7B is a front view of the PS converter 46 viewed from the LED 32 side. As shown in FIGS. 7A and 7B, the color filter 46a ′ has a predetermined rectangular shape in order to reduce color unevenness of the entire projected image. The color filter 46a ′ is formed by depositing a thin film having a function of converting chromaticity of transmitted light on the surface of the PS converter 46 on which the projection light is incident.

  In the above-described embodiment, projection may be performed without using the PS converter 46.

  In the above-described embodiment, in order to reduce the color unevenness of the entire projected image, the single condensing lens 24a provided with the color filter 24a ′ is used. However, the color filter is provided. Two or more condenser lenses may be used.

DESCRIPTION OF SYMBOLS 2 ... Camera, 4 ... Housing | casing, 6 ... Imaging window, 8 ... Projection window, 20 ... Projector module, 24 ... Condensing lens group, 24a, b ... Condensing lens, 24a ', b' ... Color filter, 26 ... Module housing, 30 ... LED holder, 32 ... LED, 46 ... PS converter, 46a ... polarization separation film, 46a '... color filter, 47 ... diffusing plate, 48 ... PBS, 50 ... LCOS.

Claims (5)

A condensing lens that collimates the light emitted from the light source and the light emitted from the light source, and has a curvature between an incident surface on which the light emitted from the light source is incident and an exit surface opposite to the incident surface. A condensing lens formed with a color filter for adjusting the chromaticity of light emitted from the light source, and having a surface area larger than that of the color filter. A projector module having a large diffusion plate and a diffusion plate that adjusts the chromaticity of parallel light emitted from the condenser lens;
An imaging unit having an image sensor for imaging a subject;
Electronic equipment having The electronic device according to claim 1,
The electronic device is characterized in that the color filter has a substantially rhombus shape. The electronic device according to claim 1,
The electronic device according to claim 1, wherein the color filter has an elliptical shape. The electronic device according to any one of claims 1 to 3,
The electronic device according to claim 1, wherein the color filter is formed on the condenser lens by vapor deposition. The electronic device according to any one of claims 1 to 4,
A polarization conversion element is disposed between the condenser lens and the diffuser plate.
Electronic equipment.

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