JP2008287168A - Optical device, optical equipment and optical component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical device capable of achieving miniaturization. <P>SOLUTION: The optical device 2 includes a first optical system 3 forming the image of a subject, a second optical system 4 forming an image different from the image of the subject, and a third optical system 5A synthesizing light incident from the first optical system 3 and light incident from the second optical system 4. The third optical system 5A includes a reflection part 52A having a plurality of reflection surfaces 521 arranged to be spaced. According to the wavelength of the incident light made incident on the third optical system 5A from the second optical system 4, the reflection surface 521 reflects the incident light and emits it from the third optical system 5A. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical device, an optical apparatus including the optical device, and an optical component used in the optical device.

  A dichroic mirror that reflects only light in a specific wavelength range is used as an optical device that displays display light that displays the focus area on the light from the subject. In the past, there has been known one that transmits light (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-237659

In such an optical device, display light and subject light are combined by a single large dichroic mirror, and the dichroic mirror itself is greatly inclined with respect to the optical axis, so that the optical device is increased in size. There was a problem.
The problem to be solved by the present invention is to provide an optical device, an optical apparatus, and an optical component that can be miniaturized.

  The invention according to claim 1 is a first optical system (3) for forming an image of a subject, a second optical system (4) for forming an image different from the image of the subject, and the first optical system. An optical device including a third optical system (5A to 5F) that combines light incident from the system and light incident from the second optical system, wherein the third optical system is spaced apart from each other. Reflecting portions (52A to 52F) each having a plurality of reflecting surfaces (521 to 525) provided separately from each other, and the reflecting surfaces are incident light incident on the third optical system from the second optical system. The optical device reflects the incident light and emits it from the third optical system in accordance with the wavelength of.

  The invention described in claim 2 is a first optical system (3) for forming an image of a subject, a second optical system (4) for forming an image different from the image of the subject, and the first optical system. An optical apparatus including a third optical system (5A to 5F) that combines light incident from the system and light incident from the second optical system, wherein the third optical system includes incident light Including reflecting portions (52A to 52F) having a plurality of reflecting surfaces (521 to 525) arranged so as to reflect substantially in the same direction, the reflecting surfaces from the second optical system to the first The optical apparatus reflects the incident light according to the wavelength of the incident light incident on the third optical system and emits the light from the third optical system.

  Invention of Claim 3 is an optical apparatus described in Claim 1 or 2, Comprising: The said reflective surface (521-525) is said 3rd optical system (3) from said 1st optical system (3). 5A to 5F) is an optical device that transmits the incident light and emits the light from the third optical system according to the wavelength of the incident light incident on the light.

  According to a fourth aspect of the present invention, there is provided an optical device according to the third aspect, in which the light reflected by the reflecting surface (521 to 525) and the light transmitted by the reflecting surface are incident. It is an optical apparatus characterized by having an optical system (6).

  The invention according to claim 5 is the optical device according to any one of claims 1 to 4, wherein the third optical system (5 </ b> A to 5 </ b> F) includes the reflecting portion (52 </ b> A to 52F) is provided in a region not provided with a transmissive portion (51A, 51B), and the transmissive portion transmits light having a wavelength reflected by the reflective surfaces (521 to 525). is there.

  A sixth aspect of the present invention is the optical device according to any one of the first to fifth aspects, wherein the reflecting surfaces (521 to 525) are provided in parallel to each other. This is an optical device.

  A seventh aspect of the present invention is the optical device according to any one of the first to sixth aspects, wherein the first optical system (3) and the third optical system (5A to 5A). 5F), and an erecting image forming unit (33) that forms an erecting image of the subject.

  The invention according to claim 8 is the optical device according to claim 7, wherein a fourth optical system (between the erect image forming part (33) and the reflecting parts (52A to 52F)) is provided. 61, 62).

  The invention according to claim 9 is the optical device according to any one of claims 1 to 8, wherein the reflecting surface (521 to 525) has a wavelength of 500 nm or less, or An optical device that reflects light having a wavelength of 600 nm or more.

  A tenth aspect of the present invention is the optical device according to any one of the first to ninth aspects, wherein the reflecting portion (52D, 52E) emits light of two or more different wavelength bands. The optical device is characterized by reflecting.

  The invention according to claim 11 is the optical apparatus according to any one of claims 1 to 10, wherein the third optical system (5F) is integrated with the reflecting portion (52F). And an optical device that includes a light guide portion that guides the light emitted from the second optical system (4).

  A twelfth aspect of the present invention is an optical apparatus (1) comprising the optical device according to any one of the first to eleventh aspects.

  The invention according to claim 13 includes a plurality of reflecting surfaces (521 to 525) for reflecting and emitting the incident light according to the wavelength of the incident light, and the reflecting surfaces are provided at intervals. This is an optical component (5A to 5F).

  The invention according to claim 14 is the optical component according to claim 12, and includes a transmission part (51 </ b> A, 51 </ b> B) that transmits light having a wavelength reflected by the reflection surface (521 to 525). The transmission part is an optical component provided in a region where the reflection surface is not provided.

  The present invention can provide an optical device, an optical apparatus, and an optical component that can be miniaturized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a schematic configuration diagram showing a single-lens reflex digital camera provided with a viewfinder device in the present embodiment, FIGS. 2A and 2B are a front view and a sectional view showing a synthesizing device in the present embodiment, and FIG. It is a schematic block diagram which shows the single-lens reflex digital camera provided with the finder apparatus in embodiment.

  As shown in FIG. 1, a single-lens reflex digital camera 1 includes a finder device 2 for confirming the composition and focus of a subject at the time of shooting, an image sensor 10 for imaging the subject, and a destination of light from the subject. And a quick return mirror 7 that switches between the image pickup device 10 and the image pickup device 10. When the photographer looks into the viewfinder device 2 and confirms the composition and focus and then presses the shutter button (not shown), the subject enters through the lens group of the interchangeable lens (not shown) attached to the mount 11. The light passes through the shutter unit 8 and the low-pass filter 9 and is guided to the image sensor 10 to be imaged.

  The viewfinder device 2 includes a subject optical system 3, a display optical system 4, a combining device 5A, and an eyepiece optical system 6. The subject optical system 3 forms an image of the subject, and the display optical system 4 forms an image that displays predetermined contents such as a focus area. Then, the combining device 5A combines the light incident from the subject optical system 3 (subject light) and the light incident from the display optical system 4 (display light), and the viewfinder optical system 6 is combined. The light is led to the eye point EP.

  The subject optical system 3 includes a focusing screen 31, a condenser lens 32, and a pentaprism 33. An image of the subject is formed on the focusing screen 31, and the subject image is collected by the condenser lens 32, and then an erect image of the subject is formed by the pentaprism 33. Note that a pentamirror may be used as a member for forming an erect image of the subject instead of the pentaprism. When the erect image of the subject is formed by the pentaprism 33, the subject light is guided to the synthesizing device 5A.

  The display optical system 4 includes a display device 41, a collimator 42, and a mirror 43. As the display device 41, for example, a liquid crystal display element (LCD: Liquid Crystal Display) that emits red display light having a wavelength of about 680 nm, a light emitting diode (LED), or the like can be used. In the present embodiment, when the reflection wavelength band of a dichroic mirror described later is set to the upper limit of the visible range of humans, the wavelength of the display light may be slightly above the lower limit of the reflection wavelength band of the dichroic mirror. If it does not specifically limit. Further, when the reflection wavelength band of the dichroic mirror is set to the lower limit of the visible range of humans, the wavelength of the display light may be set slightly below the upper limit of the reflection wavelength band. In addition, as an image formed by the display device 41, for example, a figure indicating an area to be focused, a figure indicating a position of a face in a subject, a figure indicating a remaining battery level, a figure indicating an overexposure or blackout area, Alternatively, text display (shutter speed, aperture value, exposure, white balance, shooting date / time, etc.) can be cited. The display light output from the display device 41 is converted into parallel light by the collimator 42, and the parallel light is totally reflected by the mirror 43 and guided to the synthesis device 5A.

  The synthesizing device 5A is located between the pentaprism 33 and the eyepiece optical system 6, as shown in FIG. As shown in FIGS. 2A and 2B, the synthesizing device 5A includes a main body 51A made of a transparent material that can transmit light, and a reflecting part 52A embedded in the main body 51A. Yes. An example of a material constituting the main body 51A is glass. As shown in FIG. 2B, the main body 51 </ b> A is disposed so as to be substantially perpendicular to the incident direction of the subject light from the subject optical system 3. In the present invention, the synthesizer 5A may be disposed in the eyepiece optical system 6. For example, as illustrated in FIG. 3, a combining device 5 </ b> A may be disposed between the second eyepiece lens 62 and the third eyepiece lens 63 that constitute the eyepiece optical system 6.

  Returning to FIG. 2A, the reflecting portion 52 </ b> A is composed of a plurality of strip-shaped reflecting surfaces 521 that are spaced apart from each other. Further, as shown in FIG. 2B, the reflection part 52A is disposed so as to be substantially orthogonal to the incident direction of the subject light from the subject optical system 3. Each reflecting surface 521 is configured by a dichroic mirror that reflects light having a predetermined wavelength, for example, 660 nm or more, and does not reflect light having a predetermined wavelength, for example, less than 660 nm. Each reflecting surface 521 is inclined at substantially the same angle with respect to the subject light so as to reflect the display light incident from the display optical system 4 in the same direction, and the reflecting surfaces 521 are substantially the same. It is parallel.

  In the present embodiment, the shape and size of the reflecting surface and the arrangement of the reflecting members can be arbitrarily set. For example, when the display light from the display optical system 4 is incident on the combining device 5A from the lateral direction, the reflecting surface 521 may be formed in a strip shape extending in the vertical direction. In the present embodiment, the reflection wavelength band of the reflection surface may be set, for example, in the vicinity of the upper limit or lower limit of the human visible range, and is not particularly limited as long as it is 600 nm or more or 500 nm or less.

  As shown in FIG. 1, the eyepiece optical system 6 includes first and third eyepiece lenses 61 and 63 having negative refractive power, and a second eyepiece lens 62 having positive refractive power. . The eyepiece optical system 6 guides subject light and display light combined by the combining device 5A to the eye point EP.

  Next, the operation of the finder device 2 will be described.

  When subject light enters the synthesizer 5A from the subject optical system 3, light having a wavelength of less than 660 nm passes through the reflecting surface 521 of the synthesizer 5A. Here, for example, when the photographer half-presses a shutter button (not shown), display light is output from the display device 41 of the display optical system 4 and the display light is incident on the combining device 5A via the collimator 42 and the mirror 43. Is done. The display light incident on the combining device 5 </ b> A is reflected by the reflecting surface 521, thereby being combined with the subject light transmitted through the reflecting surface 521. Thereby, for example, an image obtained by superimposing the focus area on the image of the subject is provided to the photographer via the eyepiece optical system 6.

  In the present embodiment, the thickness of the combining device 5A itself (t1 in FIG. 2B) can be reduced by dividing the reflecting portion 52A of the combining device 5A into a plurality of reflecting surfaces 521, so that the size of the viewfinder device 2 can be reduced. Can be achieved.

Second Embodiment
4A and 4B are a front view and a cross-sectional view of a synthesizing apparatus according to the second embodiment of the present invention. In the present embodiment, the shapes of the reflecting surface and the main body are different from those in the first embodiment, but the other configurations are the same as those in the first embodiment. In the following, only the differences from the first embodiment of the finder device in the second embodiment will be described, and the same components as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  In the present embodiment, as shown in FIG. 4A, the reflection part 52B is composed of a plurality of rectangular reflection surfaces 522, and the plurality of reflection surfaces 522 are arranged in a matrix at intervals. Yes. In addition, the reflective surface 522 is configured by a dichroic mirror that reflects light having a wavelength of 660 nm or more and does not reflect light having a wavelength of less than 660 nm, for example, similar to the reflective surface 521 in the first embodiment.

  In the present embodiment, as shown in FIG. 4B, a large number of convex portions 511 having a right triangular cross section are formed on the surface of the main body portion 51B. Each reflecting surface 522 is formed on the inclined surface 512 of the convex portion 511 so as to be exposed to the outside.

<Third Embodiment>
5A and 5B are a front view and a cross-sectional view of a synthesizing apparatus according to the third embodiment of the present invention. In the present embodiment, the arrangement of the reflecting surface is different from that of the first embodiment, but other configurations are the same as those of the first embodiment. In the following, only the differences from the first embodiment of the finder device in the third embodiment will be described, and the same reference numerals will be given to portions having the same configuration as in the first embodiment, and description thereof will be omitted.

  In the present embodiment, as shown in FIG. 5A, the number of reflecting surfaces 521 constituting the reflecting portion 52C is increased and the interval between adjacent reflecting surfaces 521 is narrower than that in the first embodiment. Yes. By increasing the number of the reflective surfaces 521 and narrowing the interval between the reflective surfaces 521, it is possible to increase the area in which the display device can reflect display light.

<Fourth embodiment>
FIG. 6 is an enlarged cross-sectional view of a synthesizing apparatus according to the fourth embodiment of the present invention. This embodiment is different from the first embodiment in that the reflection unit has two reflection wavelength bands, but the other configuration is the same as that of the first embodiment. In the following, only the differences from the first embodiment of the finder device in the fourth embodiment will be described, and the same reference numerals will be given to portions having the same configuration as in the first embodiment, and description thereof will be omitted.

  In the present embodiment, as shown in FIG. 6, each reflecting surface 523 constituting the reflecting portion 52D has two reflecting layers 523a and 523b. The first reflective layer 523a reflects only light with a wavelength of 600 nm or more, and does not reflect light with a wavelength of less than 600 nm. On the other hand, the second reflective layer 523b reflects only light having a wavelength of 500 nm or less, and does not reflect light having a wavelength greater than 500 nm. Thereby, both the vicinity of the upper limit and the vicinity of the lower limit of the human visible range can be adopted as the display light. Note that in the present invention, the second reflective layer 523b may be provided over the first reflective layer 523a.

<Fifth Embodiment>
FIG. 7 is an enlarged cross-sectional view of a synthesizing apparatus according to the fifth embodiment of the present invention. This embodiment is different from the first embodiment in that the reflection unit has two reflection wavelength bands, but the other configuration is the same as that of the first embodiment. Only the differences from the first embodiment will be described below with respect to the viewfinder device in the fifth embodiment, and the same reference numerals are given to the parts having the same configurations as those in the first embodiment, and the description thereof will be omitted.

  In the present embodiment, as shown in FIG. 7, the reflecting portion 52 </ b> E includes two types of reflecting surfaces 523 and 524. The first reflecting surface 523 reflects only light having a wavelength of 600 nm or more, and does not reflect light having a wavelength of less than 600 nm. On the other hand, the second reflecting surface 524 reflects only light having a wavelength of 500 nm or less, and does not reflect light having a wavelength longer than 500 nm. As a result, as in the fourth embodiment, both the vicinity of the upper limit and the vicinity of the lower limit of the human visible range can be adopted as the display light.

  In the present embodiment, as shown in FIG. 7, the first reflecting surface 523 and the second reflecting surface 524 are alternately arranged. However, the present invention is not particularly limited to this, and the first reflecting surface 524 is not limited to this. The reflecting surface 523 and the second reflecting surface 524 can be arbitrarily arranged.

<Sixth Embodiment>
FIG. 8 is a schematic configuration diagram showing a viewfinder device in a sixth embodiment of the present invention. In this embodiment, the configuration of the synthesizing apparatus is different from that of the first embodiment, but other configurations are the same as those of the first embodiment. Hereinafter, only the differences from the first embodiment of the finder device in the sixth embodiment will be described, and portions having the same configuration as in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  As shown in FIG. 8, the synthesizing device 5 </ b> F according to the present embodiment includes an optical prism 526 that totally reflects light when a predetermined incident angle is exceeded, and a reflecting portion 52 </ b> F embedded in the prism 526. ing. Similar to the first embodiment, the reflecting portion 52F is composed of a plurality of strip-like reflecting surfaces 521 that are spaced apart from each other, and each reflecting surface 521 emits light having a wavelength of 660 nm or more, for example. It is composed of a dichroic mirror that reflects and does not reflect light having a wavelength of less than 660 nm.

  When display light is output from the display device 41, the display light passes through the first surface 527 and enters the prism 526, and the second surface 528, the first surface 527, and the third surface 529. After total reflection in order, the reflection part 52F further totally reflects. On the other hand, the subject light from the subject optical system 3 passes through the first surface 527 of the prism 526 and enters the prism 526, and the light of less than 660 nm among the subject light passes through the reflecting portion 52F. Thus, the subject light and the display light are combined. The combined subject light and display light are emitted from the third surface 529 of the prism 526 and guided to the eye EP.

  By using the prism in which the reflecting portion is embedded as a synthesizer, the display optical system can be downsized in addition to the synthesizer. In the present embodiment, the display light is reflected three times in the prism 526. However, the present invention is not particularly limited to this. For example, the display light may be reflected four times or more.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, in the above-described embodiment, an example in which the present invention is applied to a finder device for a single-lens reflex digital camera has been described. However, the present invention is not particularly limited thereto, and a compact camera, a video camera, or a silver salt film is used. The present invention may be applied to a single-lens reflex camera.

  In the above-described embodiment, the reflecting surfaces 521 to 525 have been described as being configured by dichroic mirrors. However, the present invention is not particularly limited thereto, and for example, a diffraction grating may be used instead of a dichroic mirror. .

FIG. 1 is a schematic configuration diagram illustrating a single-lens reflex digital camera including a viewfinder device according to a first embodiment of the present invention. FIG. 2A is a front view showing the synthesis device according to the first embodiment of the present invention. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 2A. FIG. 3 is a schematic configuration diagram illustrating a single-lens reflex digital camera including a finder device according to another embodiment of the present invention. FIG. 4A is a front view showing a synthesizing apparatus according to the second embodiment of the present invention. 4B is a cross-sectional view taken along the line IVB-IVB in FIG. 4A. FIG. 5A is a front view showing a synthesizing apparatus according to the third embodiment of the present invention. 5B is a cross-sectional view taken along line VB-VB in FIG. 5A. FIG. 6 is an enlarged cross-sectional view of a synthesizing apparatus according to the fourth embodiment of the present invention. FIG. 7 is an enlarged cross-sectional view of a synthesizing apparatus according to the fifth embodiment of the present invention. FIG. 8 is a schematic configuration diagram showing a viewfinder device in a sixth embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Single-lens reflex digital camera 2 ... Finder apparatus 3 ... Subject optical system 33 ... Pentaprism 4 ... Display optical system 41 ... Display device 5A-5F ... Synthesis apparatus 51A-51F ... Transmission part 52A-52F ... Reflection part 521-525 ... Reflective surface 526... Prism 6. Eyepiece optical system 61 to 63... First to third eyepieces 10.

Claims (14)

A first optical system for forming an image of a subject;
A second optical system that forms an image different from the image of the subject;
An optical device including a third optical system that combines light incident from the first optical system and light incident from the second optical system,
The third optical system includes a reflecting portion having a plurality of reflecting surfaces provided at intervals,
The reflection surface reflects the incident light and emits the light from the third optical system according to the wavelength of the incident light incident on the third optical system from the second optical system. Optical device. A first optical system for forming an image of a subject;
A second optical system that forms an image different from the image of the subject;
An optical device including a third optical system that combines light incident from the first optical system and light incident from the second optical system,
The third optical system includes a reflecting portion having a plurality of reflecting surfaces arranged to reflect incident light in substantially the same direction,
The reflection surface reflects the incident light and emits the light from the third optical system according to the wavelength of the incident light incident on the third optical system from the second optical system. Optical device. An optical device according to claim 1 or 2,
The reflecting surface transmits the incident light and emits the light from the third optical system according to the wavelength of the incident light incident on the third optical system from the first optical system. Optical device. An optical device according to claim 3, wherein
An optical apparatus comprising: a finder optical system into which light reflected by the reflecting surface and light transmitted by the reflecting surface are incident. An optical device according to any one of claims 1 to 4, wherein
The third optical system includes a transmission part in a region where the reflection part is not provided,
The optical device, wherein the transmission unit transmits light having a wavelength reflected by the reflection surface.   6. The optical device according to claim 1, wherein each of the reflection surfaces is provided in parallel with each other. 7. An optical device according to any one of claims 1 to 6,
An optical apparatus comprising an erect image forming unit that is provided between the first optical system and the third optical system and forms an erect image of the subject. The optical device according to claim 7, comprising:
An optical apparatus comprising a fourth optical system provided between an erect image forming unit and the reflecting unit. An optical device according to any one of claims 1 to 8,
The optical device is characterized in that the reflection surface reflects light having a wavelength of 500 nm or less or light having a wavelength of 600 nm or more.   10. The optical device according to claim 1, wherein the reflection unit reflects light in two or more different wavelength bands. 11. An optical device according to any one of claims 1 to 10, wherein
The optical device, wherein the third optical system includes a light guide unit that is formed integrally with the reflection unit and guides light emitted from the second optical system.   An optical apparatus comprising the optical device according to any one of claims 1 to 11. In accordance with the wavelength of the incident light that has entered, a plurality of reflective surfaces that reflect and emit the incident light,
The optical component is characterized in that the reflecting surfaces are provided at a distance. The optical component according to claim 13, comprising a transmission part that transmits light having a wavelength reflected by the reflection surface,
The optical component, wherein the transmissive portion is provided in a region where the reflective surface is not provided.

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