JP2005115158A - Imaging apparatus and camera having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus having an optical system which is substantially free of attenuation in the light quantity of an object image (observation image) and a camera having the same. <P>SOLUTION: The imaging apparatus has a first wavelength selecting and beam-condensing means 7 and a second wavelength selecting and beam-condensing means 11 which reflect a specific wavelength of an incident luminous flux and transmit the other wavelength. The second wavelength selecting and beam-condensing means 11 has an imaging means 5 which is arranged near the first wavelength selecting and beam-condensing means 7 and is arranged in the focal position of the first wavelength selecting and beam-condensing means 7 and an image display means 9 which is arranged in the focal position of the second wavelength selecting and beam-condensing means 11. The imaging means 5 and the image display means 11 are arranged in the positions opposite to the optical axis of the incident luminous flux. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an imaging device that captures an object image with a light receiving element while observing the object image, displays the captured image using a display device, and enables observation along with the object image, and a camera having the imaging device.

Conventionally, there has been proposed a display device that has an imaging device that receives and images an object image of an observation optical system, and that can display an electronic image captured in the optical path of the observation optical system and observe it together with the object image of the observation optical system (For example, refer to Patent Document 1).
JP 11-174367 A

  However, in the above disclosed example, the half-mirror is used as the optical path separating unit provided in the optical path of the observation optical system. Therefore, the amount of light from the object image reaching the observer's eyes is attenuated and the object image is dark. There is a problem of becoming.

  The present invention has been made in view of the above problems, and an object thereof is to provide an imaging apparatus having an optical system with almost no object image (observed image) and a camera having the same.

  In order to achieve the above object, the present invention provides a wavelength selective condensing unit that selectively reflects a specific wavelength of an incident light beam and transmits other wavelengths, and a light beam reflected by the wavelength selective condensing unit. There is provided an imaging device comprising imaging means for receiving and imaging.

  The imaging apparatus according to the present invention further includes a light transmission member including a parallel plane member disposed substantially perpendicular to the optical axis of the incident light beam, and the wavelength selective condensing unit is disposed on the light transmission member. The imaging display means is preferably disposed in the vicinity of a surface other than the surface on which the incident light beam of the light transmission member is incident.

  In the imaging apparatus according to the present invention, it is preferable that the wavelength selective condensing unit is formed of a curved optical member or a volume hologram on which a wavelength selective thin film is formed, and the imaging unit has a focal position. .

  In addition, the present invention includes a first wavelength selective condensing unit and a second wavelength selective condensing unit that reflect a specific wavelength of an incident light beam and transmit other wavelengths. The condensing means is disposed in the vicinity of the first wavelength selective condensing means, and the imaging means disposed at the focal position of the first wavelength selective condensing means, and the second wavelength selective condensing means And an image display unit disposed at a focal position, wherein the image capturing unit and the image display unit are disposed at positions facing the optical axis of the incident light beam. To do.

  The imaging apparatus according to the present invention further includes a light transmission member including a parallel plane member disposed substantially perpendicular to the optical axis of the incident light beam, and includes the first wavelength selective condensing unit and the second wavelength. The selective condensing unit is disposed on the light transmission member, the imaging unit is disposed in the vicinity of a surface other than the surface on which the incident light beam of the light transmission member is incident, and the image display unit is configured to transmit the incident light beam. It is preferable that the optical transmission member is disposed in the vicinity of the surface of the light transmission member facing the imaging unit with respect to the optical axis.

  In the imaging apparatus according to the present invention, the first wavelength selective condensing unit and the second wavelength selective condensing unit are integrally formed by a hologram, and the image display unit It is preferable that the imaging unit is disposed at a condensing position of the folded light, and the imaging unit is disposed at a condensing position of the −1st order diffracted light of the hologram.

  Further, the present invention is arranged in the vicinity of a first light transmission member made of a plane parallel plate arranged substantially perpendicular to the optical axis of the incident light beam, and a surface other than the incident / exit surface of the first light transmission member. Provided in the vicinity of the exit surface of the first light transmission member, the first polarization separation unit that transmits the light of the specific polarization of the incident light beam incident on the first light transmission member, A first wavelength phase plate that changes a polarization direction of the light that has passed through the first polarization separation; and a light having a specific wavelength among the lights whose polarization direction is changed by the first wavelength phase plate; A first wavelength selective condensing means for condensing on the imaging means via one wavelength phase plate and the first polarization separating means, and a substantially parallel arrangement on the exit surface side of the first light transmission member. A second light transmission member comprising a plane-parallel plate having an incident surface, and an insertion of the second light transmission member. Image display means arranged in the vicinity of a surface other than the light-projecting surface, and a characteristic of reflecting light of a specific polarization direction, and the light beam incident on the second light transmission member from the image display means A second polarization separation means that reflects to the incident surface side of the light transmission member; and a polarization direction of the light reflected by the second polarization separation means, provided in the vicinity of the incidence surface of the second light transmission member. A second wavelength phase plate to be changed, and light having a specific wavelength out of the light whose polarization direction has been changed by the second wavelength phase plate, and the second wavelength phase plate and the second polarization separation means There is provided an imaging apparatus comprising a second wavelength selective condensing unit that emits light to an emission surface side of the second light transmission member.

  In the imaging apparatus according to the present invention, the first and second polarization separation means, the first and second wavelength phase plates, the polarization conversion means, the first and second wavelength selective condensing means, It is preferable that the image pickup unit and the image display unit are integrally formed on a light transmission member made of a parallel plate member substantially perpendicular to the optical axis of the incident light beam.

  In the imaging apparatus according to the present invention, it is preferable that the image display means is a liquid crystal display device or a scanning display device.

  In the imaging apparatus according to the present invention, each of the first wavelength selective condensing unit and the second wavelength selective condensing unit may be a curved optical member having a wavelength selective thin film or a volume hologram. Preferably it is formed.

  The present invention also provides a camera characterized in that the imaging device is provided in the vicinity of a finder optical system.

  According to the present invention, it is possible to provide an imaging apparatus having an optical system that hardly attenuates the amount of light of an object image (observation image) and a camera having the same.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic configuration diagram of the imaging apparatus according to the first embodiment of the present invention, and FIG. 2 is a diagram illustrating spectral characteristics of the wavelength selective condensing unit in the first embodiment.

  In FIG. 1, an imaging apparatus 1 includes a pair of planes 3a and 3b that are substantially perpendicular to an optical axis IP of an incident light beam (hereinafter also referred to as a background light beam) from an object, and a plane 3c that is substantially perpendicular to the planes 3a and 3b. It has the light transmission member 3 which consists of a parallel plane member. The light transmission member 3 has a spectral characteristic that selectively reflects specific wavelengths (for example, blue λB, green λG, red λR) of the incident light flux as shown in FIG. 2 and transmits other wavelengths, A wavelength selective condensing means 7 for condensing the reflected light beam having a specific wavelength on the image pickup device 5 provided in the vicinity of the plane 3c is arranged inclined with respect to the optical axis IP. The image sensor 5 is connected to a control device (not shown), an image memory, and the like.

  An incident light beam from an object (not shown) on the right side in FIG. 1 is incident from the incident surface 3a side of the light transmission member 3 along the optical axis IP, and is wavelength-selective condensing provided to be inclined to the optical axis IP. By means 7, only specific wavelengths (λB, λG, λR) in the incident light beam are reflected and condensed on the image sensor 5. Light beams other than a specific wavelength pass through the wavelength selective condensing means 7, exit from the exit surface 3 b side of the light transmission member 3, and an object image is observed by the eyes of the observer positioned at the eye point EP.

  As shown in FIG. 2, the wavelength selective condensing means 7 has a steep reflection characteristic in narrow wavelength bands corresponding to the wavelengths (λB, λG, λR), and almost reflects the light flux of these wavelengths. A light beam having a wavelength other than is a concave optical member (for example, a concave mirror) formed with a wavelength-selective thin film having a characteristic of transmitting almost all, and its focal position is disposed in the vicinity of the plane 3c of the light transmission member 3 It is formed so as to be positioned on the image sensor.

  Since the wavelength selective condensing means 7 reflects only a specific wavelength in a narrow wavelength band and transmits all other wavelengths, the light of the background light flux and the color change are observed in the eyes of the observer observing at the eye point EP. There is no feeling.

  Since the image reflected by the wavelength selective condensing means 7 and picked up by the image pickup device 5 includes three color components of blue (λB), green (λG), and red (λR), a full-color image is obtained. be able to. For this reason, the captured image can be stored in an image memory (not shown), and can be viewed as a photograph by performing printing, for example.

  As described above, in the first embodiment, it is possible to configure an imaging apparatus that can capture a full-color image without affecting the appearance of the observed object image. For example, glasses-type imaging devices (cameras), head-mounting imaging devices, and the like are examples of applications.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings.

  FIG. 3 is a schematic configuration diagram of an imaging apparatus according to the second embodiment of the present invention. In this embodiment, the image display means and the second wavelength selective light collecting means having the light condensing property for projecting the display image displayed on the image display means to the eye point are provided in the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 3, an incident light beam (hereinafter also referred to as background light beam) from an object (not shown) on the right side in FIG. 3 is incident from the incident surface 3a side of the light transmission member 3 along the optical axis IP. A first wavelength selection of a concave shape (for example, a concave mirror) that is inclined to the IP and reflects only a specific wavelength (blue λB, green λG, red λR) in the incident light beam and collects it on the image sensor 5. Condensing means 7 is arranged.

  Further, the second wavelength of the concave shape (for example, concave mirror) in which the image display means 9 is arranged on the plane 3d opposite to the plane 3c on which the imaging element 5 of the light transmission member 3 is arranged and the image display means 9 has a focal position. The selective condensing means 11 is arranged so that the convex surface side thereof faces the convex surface side of the first wavelength selective condensing means 7. Thus, the imaging device 101 having the image display means 9 is configured.

  Light fluxes other than a specific wavelength of the background light flux pass through the first wavelength selective condensing means 7 and the second wavelength selective condensing means 11 and are emitted from the light exiting surface 3b side of the light transmission member 3 to form an eye point. The object image is observed by the eyes of the observer located at the EP. The spectral characteristics of the second wavelength selective condensing means 11 are substantially the same as those of the first wavelength selective condensing means 7 shown in FIG.

  A light beam having a specific wavelength (λB, λG, λR) from the image display means 9 is reflected by the second wavelength selective light collecting means 11 toward the eye point EP and displayed on the image display means 9. Is observed by the observer. As a result, the incident light beam from an object (not shown) on the right side in the figure and the display image displayed on the image display device 9 are superimposed and can be observed at the eye point EP.

  An incident light beam from an object (not shown) is incident from the incident surface 3a side of the light transmission member 3 along the optical axis IP, and is incident by the first wavelength selective condensing means 7 provided to be inclined to the optical axis IP. Only specific wavelengths (λB, λG, λR) in the light beam are reflected and condensed on the image sensor 5. A light beam having a wavelength other than the specific wavelength is transmitted through the first wavelength selective condensing unit 7 and further transmitted through the second wavelength selective condensing unit 11, and is emitted from the exit surface 3b side of the light transmission member 3. The object image is observed by the eyes of the observer located at the eye point EP.

  The spectral characteristics of the first wavelength selective condensing means 7 and the second wavelength selective condensing means 11 are narrow wavelength bands corresponding to blue (λB), green (λG), and red (λR) as shown in FIG. A concave optical member (for example, concave mirror) on which a wavelength selective thin film is formed that has a steep reflection characteristic, reflects most of light beams of these wavelengths, and transmits almost all light beams of other wavelengths. It is. The first wavelength selective condensing means 7 is formed so that the focal position of the first wavelength selective condensing means 7 is an image sensor arranged in the vicinity of the plane 3 c of the light transmission member 3, and the focal position of the second wavelength selective condensing means 11 is It is formed so as to be the image display means 9 arranged on the plane 3d of the light transmission member 3.

  As described above, the first wavelength selective condensing unit 7 and the second wavelength selective condensing unit 11 reflect only specific wavelengths (λB, λG, λR) in a narrow wavelength band and transmit all other wavelengths. Therefore, the observer's eyes observing at the position of the eye point EP do not feel any change in the amount of light or color of the background luminous flux.

  The image reflected by the first wavelength selective condensing means 7 and picked up by the image pickup device 5 includes three color components of blue (λB), green (λG), and red (λR). An image can be obtained. This full-color image is displayed on the image display means 9 by appropriately processing it through a control device (not shown), etc., and reflected by the second wavelength selective condensing means 11 so that it can be observed at the eye point EP. By doing so, it becomes possible to superimpose the display image of the image display means 9 and the object image by the background light beam. Further, by displaying other control information or the like on the image display means 9, it is possible to superimpose the control information or the like on the background object image so as to enable observation at the eye point EP. Further, the captured image is stored in an image memory (not shown), and can be viewed as a photograph by performing a printing process, for example.

  As described above, in the second embodiment, the object image of the background luminous flux is not affected at all by appearance, and a full color image can be captured, and the captured image and control information are displayed on the image display means. In addition, it is possible to provide an imaging device that can be observed with the eye point superimposed. For example, an imaging apparatus (camera) having a glasses-type image display means, an imaging apparatus having a head-mounting image display apparatus, and the like are given as application examples.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to the drawings.

  FIG. 4 is a schematic configuration diagram of an imaging apparatus according to the third embodiment of the present invention. In the present embodiment, the first and second wavelength selective condensing means of the second embodiment are changed to volume hologram elements. The same components as those in the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  4, an incident light beam (hereinafter also referred to as a background light beam) from an object (not shown) on the right side in FIG. 4 is incident from the incident surface 3a side of the light transmission member 3 along the optical axis IP. A first volume hologram 17 is provided that is inclined with respect to the IP, reflects only specific wavelengths (blue λB, green λG, and red λR) in the incident light beam and collects the light on the image sensor 5.

  In addition, the image display means 9 is arranged on the plane 3d opposite to the plane 3c on which the imaging element 5 of the light transmission member 3 is arranged, and the second volume hologram 21 having a focal position on the image display means 9 (spectral characteristics are the first). 1 is substantially the same as the volume hologram 1 of FIG. Thus, the imaging device 201 having the image display means 9 is configured. The inclination angle of the volume holograms 17 and 21 with respect to the optical axis IP can be changed as appropriate depending on the design of the volume holograms 17 and 21.

  A light beam having a wavelength other than a specific wavelength in the background light beam passes through the first volume hologram 17 and the second volume hologram 21, and is emitted from the emission surface 3 b side of the light transmission member 3 and positioned at the eye point EP. The object image is observed by the observer's eyes.

  A light beam having a specific wavelength (λB, λG, λR) from the image display means 9 is reflected by the second volume hologram 21 toward the eye point EP, and the display image displayed on the image display means 9 is observed. Observed by the person. As a result, the incident light beam from an object (not shown) on the right side in the figure and the display image displayed on the image display device 9 are superimposed and can be observed at the eye point EP.

  The spectral characteristics of the first and second volume holograms 21 have the characteristics shown in FIG. Since the volume holograms 17 and 21 have high diffraction efficiency and most of the usable light is first-order diffracted light, if two identical volume holograms are used back-to-back, the characteristics are the same as those of a mirror. can get. Further, if the two volume holograms 17 and 21 are attached to two trapezoidal prisms (for example, having an angle of 30 degrees) and the volume hologram side is joined, the imaging device 201 that is thinner than when a mirror is used. Can be configured.

  Other operations and effects are the same as those of the second embodiment, and a description thereof will be omitted.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to the drawings.

  FIG. 5 is a schematic configuration diagram of an imaging apparatus according to the fourth embodiment of the present invention. In the present embodiment, the first and second wavelength selective condensing means of the second or third embodiment are changed to one thin hologram element. The same components as those in the second or third embodiment are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 5, an incident light beam (hereinafter also referred to as a background light beam) from an object (not shown) on the right side in FIG. 5 is incident from the incident surface 3a side of the light transmission member 3 along the optical axis IP. Provided with inclination to IP, only specific wavelengths (blue λB, green λG, red λR) in the incident light beam are diffracted, and −1st order diffracted light is condensed on the image sensor 5.

  Further, the image display means 9 is arranged on the plane 3d opposite to the plane 3c on which the imaging element 5 of the light transmission member 3 is arranged, and the hologram 25 having the focal position of the + 1st order diffracted light on the image display means 9 is placed on the optical axis IP. It is disposed at an angle of approximately 45 degrees. Thus, the imaging device 301 having the image display device 9 is configured.

  Light beams other than a specific wavelength in the background light beam pass through the hologram 25 and are emitted from the light exit surface 3b side of the light transmission member 3 so that the object image is observed by the eyes of the observer positioned at the eye point EP. The spectral characteristics of the hologram 25 have the characteristics shown in FIG.

  A light beam having a specific wavelength (λB, λG, λR) from the image display means 9 is reflected by the hologram 25 toward the eye point EP, and a display image displayed on the image display means 9 is observed by an observer. . As a result, the incident light beam from an object (not shown) on the right side in the figure and the display image displayed on the image display device 9 are superimposed and can be observed at the eye point EP.

  The thin hologram 25 has a feature that it is very easy to manufacture, although optical restrictions are larger than the volume holograms 17 and 21 of the third embodiment, and an optical member is manufactured at low cost. Therefore, the price of the imaging device 301 itself can be reduced.

  Other operations and effects are the same as those of the third embodiment, and a description thereof will be omitted.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to the drawings.

  FIG. 6 is a schematic configuration diagram of an imaging apparatus according to the fifth embodiment of the present invention, FIG. 7 is an enlarged schematic configuration diagram of a wavelength selection member used in the fifth embodiment, and FIG. 3 shows an example of spectral characteristics of wavelength selective polarization separation means used in the embodiment. In the present embodiment, an imaging optical system member that captures an object image and an image display optical member that displays an image are configured separately.

  6 and 7, an incident light beam (hereinafter also referred to as a background light beam) from an object image incident from the right direction in the drawing enters the imaging device 401 along the optical axis IP.

  P-polarized light in the light beam incident along the optical axis IP is incident from the incident surface 31a of the first light transmission member 31 formed of a parallel plane member substantially perpendicular to the optical axis IP, and is inclined with respect to the optical axis IP. The first polarized light separating means 33 is disposed and has the characteristics shown in FIG. The first polarization separation unit 33 reflects S-polarized light having a specific wavelength and transmits light beams having other wavelengths.

  The background light that has passed through the first polarized light separating means 33 is provided with a first quarter wavelength phase plate 37 and a first wavelength selective condensing means 39 disposed on the exit surface 31 b of the first light transmission member 31. The first wavelength selective condensing member 35 is made incident.

  The first wavelength selective condensing means 39 is a concave mirror or a volume hologram (hereinafter referred to as a volume hologram 39) in which a wavelength selective thin film is formed and a focal position is in the image pickup device 9, and a spectral as shown in FIG. It has characteristics, and is formed so as to selectively reflect specific wavelengths (λB, λG, λR) and transmit other wavelengths.

  The P-polarized background light beam passes through the first quarter-wave phase plate 37, the light beam having a specific wavelength is reflected by the volume hologram 39, and returns to the incident side of the background light beam along the optical axis IP. 1 quarter-wave phase plate 37. Since the light beam having a specific wavelength reflected by the volume hologram 39 passes through the first quarter-wave phase plate twice, the polarization direction is rotated by 90 degrees, and the original P-polarized light is converted to S-polarized light.

  The light beam having a specific wavelength of the S-polarized light returns to the incident side along the optical axis IP, is reflected by the first polarization separation means 33 that reflects the S-polarized light having the specific wavelength, and the traveling direction is changed. The light transmitting member 31 is focused and imaged on the imaging device 9 provided in the vicinity of the surface 31c other than the incident surface 31a and the exit surface 31b, and stored in an image memory via an image control device (not shown).

  On the other hand, the light beam having a wavelength other than the specific wavelength transmitted through the first wavelength selective condensing means 39 is provided on the second light transmission member 41 (to be described later) disposed on the emission surface 31 b side of the first light transmission member 31. Observation that is transmitted through the second wavelength selective condensing means 49 and the second quarter-wave phase plate and through the second polarization separation means 43 having the characteristics shown in FIG. Observed by the person's eyes.

  The second light transmission member 41 is a parallel flat member arranged on the background light beam exit side of the first light transmission member 31, and the background light flux entrance surface 41a and the background light flux exit surface 41b are different. Image display means 11 is arranged in the vicinity of the surface.

  A full-color (λB, λG, λR mixed color) luminous flux (S-polarized light) from the display image of the image display means 11 is arranged to be inclined with respect to the optical axis IP, and reflects the S-polarized light having a specific wavelength. The light is reflected by the polarization separation means 43 and travels along the optical axis IP to the incident side of the background light flux.

  The luminous flux of the display image reflected by the second polarized light separating means 43 and the second quarter-wave phase plate 47 and the second phase light plate disposed on the incident surface 41 a side of the background luminous flux of the second light transmission member 41. Is incident on a second wavelength selective condensing member 45 comprising the wavelength selective condensing means 49.

  The second wavelength selective condensing means 49 is a concave mirror on which a wavelength selective thin film is formed, or a volume hologram (hereinafter referred to as volume hologram 49), and the focal position is in the image display means 11, as shown in FIG. It has such spectral characteristics that it selectively reflects specific wavelengths (λB, λG, λR) and transmits other wavelengths. For this reason, the light beam of the S-polarized display image having a specific wavelength reflected by the second polarization separation means 43 passes through the second quarter-wave phase plate 47, is reflected by the volume hologram 49, and is reflected on the optical axis. It returns to the second polarization separation means 43 side along the IP and passes through the second quarter-wave phase plate 47 again. Since the original S-polarized light beam having a specific wavelength passes through the quarter-wave phase plate twice, the polarization direction is rotated by 90 degrees and converted to P-polarized light.

  The light beam of the P-polarized display image passes through the second polarization separation unit 43 and is emitted from the emission surface 41b of the light transmission member 41 and is observed by the observer's eye located at the eye point EP.

  The first light transmission member 31 and the second light transmission member 41 are integrally formed by bonding the exit surface 31b of the background light flux and the incident surface 41a with, for example, an optical adhesive, and the image display device 11 is formed. An imaging apparatus 401 is configured.

  The optical axis of the incident light beam shown in FIG. 6 used for the description of the present embodiment and the optical axis of the display light beam emitted from the second wavelength selection member and directed to the eye point are drawn shifted for the sake of explanation. . Moreover, it is also possible to configure by shifting both optical axes.

  Other functions and effects are the same as those of the second embodiment, and a description thereof will be omitted.

  As the first and second polarization separation means used in the fifth embodiment, wavelength selective polarization separation means having spectral characteristics as shown in FIG. 8 is used. This wavelength selective polarization separation means has a characteristic of reflecting only S-polarized light of specific wavelengths (for example, λB, λG, λB) and transmitting light beams of other wavelengths. By using such a wavelength selective polarization separation means, it is possible to further suppress the optical loss of the background light beam and the display light beam. The first and second polarization separation means 33 and 43 can achieve the same effect even if PBS that reflects S-polarized light and transmits P-polarized light is used.

  In the imaging apparatus according to the first to fifth embodiments, it is possible to observe an object image with almost no attenuation of the background luminous flux as perceived by the observer's eye located at the eye point EP, and to capture a full-color object image. can do. Further, a photograph is obtained by printing the captured image, and these imaging devices also have a function as a camera.

  In the second to fifth embodiments, an object image with little attenuation of the background light beam can be observed, and a full-color image is taken and observed by being superimposed on the object image via the image display means. It becomes possible to do. In addition, by applying some color conversion or enhancement to the display image and superimposing it on the object image, various information can be given to the observer. Various information can also be given to the observer by displaying characters and patterns on the image display means.

  In the second to fifth embodiments, the control device for the image display means is not shown. As the image display means, an organic EL display device, a small LCD having a backlight, a retinal scanning type display means described later, or the like can be used.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to the drawings.

  FIG. 9 is a schematic configuration diagram of a “camera using an imaging device” according to the sixth embodiment of the present invention. In the present embodiment, the above-described imaging device is arranged in the vicinity of the finder optical system of the single-lens reflex camera.

  In FIG. 9, an image pickup apparatus 501 is an image pickup apparatus 501 having a configuration using the volume holograms 17 and 21 shown in the third embodiment. However, unlike the third embodiment, the image display means is a scanning type. Image display means is used. The scanning image display means will be described later. Moreover, the same code | symbol is attached | subjected to the structure similar to 3rd Embodiment, and description is abbreviate | omitted.

  In FIG. 9, an incident light beam from an object (not shown) is guided to a mirror (for example, a half mirror or a quick return mirror) 53 through a photographing lens 51, reflected by the mirror 53, and focused on a focusing screen 55. The object image formed on the focusing screen 55 enters the eyepiece lens 59 via the pentaprism 57 and is observed by the observer's eye located at the eye point EP.

  An imaging device 501 according to the above-described embodiment of the present invention is disposed on the optical axis IP between the eyepiece lens 59 and the eye point EP. Note that the imaging device 501 may be disposed between the pentaprism 57 and the eyepiece lens 59.

  The imaging apparatus 501 has the same configuration as that of the imaging apparatus according to the third embodiment of the present invention, and only the image display apparatus is different. Therefore, the image display unit is described, and the description of the other configurations is omitted. To do.

  In the image display means, a microlens array 61 arranged in a two-dimensional manner is arranged in an image display unit arranged in the vicinity of the plane 3d of the light transmission member 3. In the vicinity of the microlens array 61, scanning means 63 is provided that bends light from the light source 62 approximately 90 degrees and scans the macrolens array 61 two-dimensionally. The light from the light source 62 is condensed by a collimator lens system 65 onto a microlens array 61 (also referred to as image display means), and the light source 62 has a light source modulation means 67 for controlling the brightness and ON / OFF of the light source. The scanning means 63 is provided with a scanning control means 69 for controlling the incident light in two dimensions, and a synchronous control means for controlling the light source modulation means 67 and the scanning control means 69 to operate in synchronization. 71 is provided.

  A light beam from an object emitted from the eyepiece lens 59 is incident from the incident surface 3a side of the light transmission member 3 along the optical axis IP, and is inclined with respect to the optical axis IP. A specific wavelength (blue λB) in the incident light beam is provided. , Green λG, red λR) is reflected and is incident on the first volume hologram 17 that is focused on the image sensor 5. A light beam having a specific wavelength in the background light beam reflected by the volume hologram 17 is picked up by the image sensor 5, and a full-color image is stored in an image memory (not shown) or the like.

  The second volume hologram 21 having a focal position on the microlens array 61 disposed on the plane 3d facing the plane 3c on which the imaging element 5 of the light transmission member 3 is disposed (the spectral characteristic is the first volume hologram). Is substantially the same as the first volume hologram 17 and the back surface thereof are opposed to each other and inclined with respect to the optical axis IP. In this way, a camera in which the imaging device 501 having the image display means 61 is arranged is configured.

  A light beam having a wavelength other than a specific wavelength in the background light beam passes through the first volume hologram 17 and the second volume hologram 21, and is emitted from the emission surface 3 b side of the light transmission member 3 and positioned at the eye point EP. The object image is observed by the observer's eyes.

  Further, a light beam having a specific wavelength from the microlens array 61 is reflected by the second volume hologram 21 and is observed by an observer's eye located at the eye point EP.

  Further, the spectral characteristics of the first and second volume holograms 17 and 21 have the characteristics shown in FIG.

  In the sixth embodiment, the light beam from the subject incident through the photographing lens 51 can be observed as an optical image at the eye point EP with almost no attenuation due to the sensitivity of the observer's eyes. It is possible to observe the captured subject image superimposed on the eye point EP as a display image via the image display means 61. At this time, since it is possible to display the display image with color change, conversion, and emphasis added, it is possible to give various information about the image to the observer.

  Moreover, by mounting on a finder optical system of a single-lens reflex camera using a conventional silver salt film, an image picked up by the image pickup device 5 can be displayed on the image display means 61 or separately printed. It becomes possible to have a function.

  Moreover, it can also arrange | position in the finder part of lens shutter type | mold cameras other than a single-lens reflex camera, and can arrange | position in this case either before or after a finder.

  The above-described embodiment is merely an example, and is not limited to the above-described configuration and shape, and can be appropriately modified and changed within the scope of the present invention.

1 is a schematic configuration diagram of an imaging apparatus according to a first embodiment of the present invention. It is a figure which shows the spectral characteristic of the wavelength selection condensing means in 1st Embodiment. The schematic block diagram of the imaging device concerning 2nd Embodiment of this invention is shown. The schematic block diagram of the imaging device concerning 3rd Embodiment of this invention is shown. The schematic block diagram of the imaging device concerning 4th Embodiment of this invention is shown. The schematic block diagram of the imaging device concerning 5th Embodiment of this invention is shown. It is a figure which shows the expansion schematic structure of the wavelength selection member in 5th Embodiment of this invention. It is a figure which shows an example of the spectral characteristic of the wavelength selection type | mold polarization separation means used for 5th Embodiment. The schematic block diagram of the "camera which has an imaging device" concerning 6th Embodiment of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 101, 201, 301, 401, 501 Imaging device 3 Light transmission member 5 Imaging element 7 Wavelength selection condensing means (1st wavelength selection condensing means)
DESCRIPTION OF SYMBOLS 9 Image display means 11 2nd wavelength selection condensing means 17 1st volume hologram 21 2nd volume hologram 25 Hologram 31 1st light transmission member 33 1st polarization separation means 35 1st wavelength selection member 37 1st 1/4 wavelength phase plate 39 1st wavelength selection condensing means 43 2nd polarization separation means 45 2nd wavelength selection member 47 2nd 1/4 wavelength phase plate 49 2nd wavelength selection collection Optical means 51 Shooting lens 53 Mirror 55 Focus plate 57 Penta prism 59 Eyepiece 61 Micro lens array 62 Light source 63 Scan means 65 Collimator lens system 67 Light source modulation means 69 Scan control means 71 Synchronization control means

Claims (11)

Wavelength selective condensing means for selectively reflecting a specific wavelength of an incident light beam and transmitting other wavelengths;
An imaging apparatus comprising: an imaging unit that receives and images the light beam reflected by the wavelength selective condensing unit. A light transmission member comprising a parallel plane member disposed substantially perpendicular to the optical axis of the incident light beam;
The wavelength selective condensing means is disposed on the light transmission member,
The imaging apparatus according to claim 1, wherein the imaging display unit is disposed in the vicinity of a surface other than a surface on which the incident light flux of the light transmission member is incident.   The said wavelength selection condensing means is formed with the curved-surface-shaped optical member or volume hologram in which the wavelength selective thin film was formed, and has a focus position in the said imaging means, The said 1 or 2 characterized by the above-mentioned. Imaging device. A first wavelength selective condensing unit and a second wavelength selective condensing unit that reflect a specific wavelength of the incident light flux and transmit other wavelengths;
The second wavelength selective condensing means is disposed in the vicinity of the first wavelength selective condensing means,
Imaging means arranged at a focal position of the first wavelength selective condensing means;
An image display means disposed at a focal position of the second wavelength selective condensing means,
An image pickup apparatus, wherein the image pickup means and the image display means are arranged at positions facing the optical axis of the incident light beam. A light transmission member comprising a parallel plane member disposed substantially perpendicular to the optical axis of the incident light beam;
The first wavelength selective condensing means and the second wavelength selective condensing means are disposed on the light transmission member,
The imaging means is disposed in the vicinity of a surface other than the surface on which the incident light flux of the light transmission member is incident,
The imaging apparatus according to claim 4, wherein the image display unit is disposed in the vicinity of a surface of the light transmission member that faces the imaging unit with respect to an optical axis of the incident light beam. The first wavelength selective condensing means and the second wavelength selective condensing means are integrally formed by a hologram,
The image display means is disposed at a condensing position of the first-order diffracted light of the hologram,
The imaging apparatus according to claim 4, wherein the imaging unit is disposed at a condensing position of −1st order diffracted light of the hologram. A first light transmission member comprising a plane parallel plate disposed substantially perpendicular to the optical axis of the incident light beam;
Imaging means disposed in the vicinity of a surface other than the incident / exit surface of the first light transmission member;
First polarization separation means that transmits light of a specific polarization of the incident light beam incident on the first light transmission member;
A first wavelength phase plate that is provided in the vicinity of an emission surface of the first light transmission member and changes a polarization direction of light transmitted through the first polarization separation;
Of the light whose polarization direction has been changed by the first wavelength phase plate, the light having a specific wavelength is reflected and condensed on the imaging means via the first wavelength phase plate and the first polarization separation means. First wavelength selective condensing means;
A second light transmission member comprising a plane-parallel plate having an incident surface disposed substantially parallel to an emission surface side of the first light transmission member;
Image display means disposed in the vicinity of a surface other than the incident / exit surface of the second light transmission member;
Second polarization separation means having a characteristic of reflecting light of a specific polarization direction and reflecting a light beam incident on the second light transmission member from the image display means to an incident surface side of the second light transmission member When,
A second wavelength phase plate that is provided in the vicinity of the incident surface of the second light transmission member and changes the polarization direction of the light reflected by the second polarization separation unit;
Of the light whose polarization direction has been changed by the second wavelength phase plate, the light having a specific wavelength is reflected, and the second light transmission member passes through the second wavelength phase plate and the second polarization separation means. An image pickup apparatus comprising: a second wavelength selective condensing unit that emits light toward the light exit surface side.   The first and second polarization separation means, the first and second wavelength phase plates, the first and second wavelength selective focusing means, the imaging means, and the image display means The imaging apparatus according to claim 7, wherein the imaging apparatus is formed integrally with a light transmission member made of a parallel plate member substantially perpendicular to the optical axis.   The imaging apparatus according to any one of claims 4 to 8, wherein the image display means includes a liquid crystal display device or a scanning display device.   The first wavelength selective condensing unit and the second wavelength selective condensing unit are each formed of a curved optical member having a wavelength selective thin film or a volume hologram. Item 9. The imaging device according to Item 4 or 5 or 7 or 8.   11. A camera comprising the imaging apparatus according to claim 1 provided in the vicinity of a finder optical system.

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