JP2009192808A - Imaging body portion and imaging apparatus equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging body portion capable of using an imaging element having a photodetector portion different in size though it is thin, and a finder optical system suitable for size of the photodetector portion, and to provide an imaging apparatus. <P>SOLUTION: The imaging body portion includes an attach/detach portion to which an optical unit is detachably attached, the imaging element, a conversion optical system and the finder optical system. The conversion optical system is an optical system to form an intermediate image, and the finder optical system includes an optical path bending member. The optical path bending member is provided on an opposite side to the imaging element while putting the attach/detach portion in between, and the direction of a reflection surface of the optical path bending member is set so that the optical axis of the optical path which has been bent may be parallel with the optical axis of the conversion optical system. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an imaging main body unit to which a photographic optical system can be attached and detached, and an imaging apparatus.

A camera is known in which an image sensor can be replaced with one of a different size according to the purpose of photographing (see Patent Document 1). This camera includes a substantially horizontally long box-shaped camera body and a photographing lens for a silver salt single-lens reflex camera. As the camera body, the camera body for the silver salt single-lens reflex camera is used as it is. As the back cover, there are a silver salt camera and a digital camera. Then, the back cover for the digital camera can be attached to the camera body, and can be used as a digital camera. Furthermore, the CCD substrate can be exchanged. Thereby, different digital cameras can be configured by one camera body 2.
JP 2000-59655 A

  In the technique described in Patent Document 1, the size of the light receiving unit of each replaceable CCD is 16 mm wide × 12 mm long and 24 mm wide × 18 mm long. This is smaller than the size 36 mm × 24 mm of the silver salt film. For this reason, it has been impossible to use an image pickup element having a large light receiving portion.

  The present invention has been made in view of these problems of the prior art, and an object of the present invention is to provide an imaging main body that can use an imaging device that is thin but has a different size of the light receiving unit. It is to provide a finder optical system that is easy to observe. Moreover, it is providing the imaging device provided with the imaging main-body part.

  The imaging main body of the present invention that achieves the above object is an imaging main body having a detachable part from which an optical unit is detachably attached, an imaging element, a conversion optical system, and a finder optical system, wherein the conversion optical system is An optical system for forming an intermediate image, wherein the finder optical system has an optical path bending member, and the optical path bending member is provided on the opposite side of the image pickup element with the detachable portion interposed therebetween, and is reflected by the optical path bending member The direction of the surface is set so that the optical axis of the optical path after bending is parallel to the optical axis of the conversion optical system, and another optical system is arranged in the optical path after bending.

  Further, the another optical system includes another optical path bending member and an eyepiece, and the another optical path bending member is disposed on the light incident side of the eyepiece and transmits light emitted from the eyepiece. It is provided so that it may reflect in the direction away from the optical axis of a conversion optical system.

  The another optical system includes an imaging optical system and an eyepiece lens, the imaging optical system is an optical system that forms an intermediate image, and the optical axis of the eyepiece lens is light of the conversion optical system. It is provided so that it may become parallel to an axis | shaft.

  In addition, an image pickup apparatus of the present invention that achieves the above object includes the above-described image pickup main body and the optical unit.

  According to the present invention described above, it is possible to obtain an imaging main body that can be used with imaging devices having a thin light-receiving part while being thin, and a viewfinder optical system that can be easily observed. In addition, an imaging device including the imaging main body can be obtained.

  An embodiment of the present invention will be described. The imaging main body of the first embodiment is shown in FIG. In FIG. 1, the imaging main body 1 includes a detachable part 2, an imaging element 3, a conversion optical system 4, and a finder optical system 6. The detachable part 2 is, for example, a bayonet. The optical unit can be attached / detached via the attaching / detaching portion 2. In the present embodiment, the filter 5 is disposed in front of the image sensor 3.

  The conversion optical system 4 is disposed between the detachable portion 2 and the image sensor 3. By this conversion optical system 4, an intermediate image I is formed between the detachable part 2 and the image sensor 3.

  The conversion optical system 4 includes front lens systems 4a and 4b and a rear lens system 4c. The front lens systems 4a and 4b have a positive refractive power as a whole. Further, the rear lens system 4c has a positive refractive power as a whole.

  Here, the front lens systems 4a and 4b include a lens 4a having a positive refractive power disposed in the vicinity of the intermediate image I and a lens 4b having another positive refractive power. Since the lens 4a is disposed in the vicinity of the intermediate image, it functions as a field lens.

  In FIG. 1, each of the front lens systems 4a and 4b and the rear lens system 4c is a single lens. However, the front lens systems 4a and 4b and the rear lens system 4c may each be composed of a plurality of lenses.

  The conversion optical system 4 is an optical system that forms an intermediate image. In this way, an image with less aberration can be obtained even when the image of the subject is enlarged.

  The viewfinder optical system 6 has an optical path bending member 10. In this embodiment, the optical path bending member 10 is a prism. The optical path bending member 10 may be a mirror. The direction of the reflecting surface of the optical path bending member 10 is set so that the optical axis L2 of the optical path after bending is parallel to the optical axis L1 of the conversion optical system 4. The optical axis L1 and the optical axis L2 do not have to be completely parallel. Another optical system is arranged in the optical path after bending.

  Here, the imaging unit main body 1 of the present embodiment does not have an optical path dividing means in the imaging unit main body 1. The optical path dividing means is provided in an optical unit described later. Therefore, when the optical unit is mounted on the image pickup unit main body 1, the optical unit is positioned such that the optical path dividing means is in front of the detachable part 2 (on the opposite side of the image pickup element 3 with the detachable part 2 interposed). Therefore, the optical path bending member 10 is provided on the side opposite to the imaging element 3 with the detachable part 2 interposed therebetween. Thereby, the light reflected by the optical path dividing means, that is, the light from the subject can be guided to the finder optical system 6.

  The finder optical system 6 includes an optical system that does not form an intermediate image (hereinafter referred to as a second intermediate image) in the finder optical system 6 and an optical system that forms a second intermediate image. In the present embodiment, the viewfinder optical system 6 is an optical system that does not form a two intermediate image. Therefore, the finder optical system 6 includes another optical path bending member 11 and an eyepiece 12 as another optical system.

  Light from the subject travels to the viewfinder optical system 6 through the optical unit. Then, an intermediate image (hereinafter referred to as a first intermediate image I ′) is formed. Subsequently, the light enters the optical path bending member 10. Here, the optical path bending member 10 is a pentaprism. The light that has passed through the incident surface 10a of the pentaprism is reflected by the first reflecting surface 10b and travels toward the second reflecting surface 10c. The direction of the reflecting surface of the second reflecting surface 10c is set so that the optical axis L2 of the optical path after bending is parallel to the optical axis L1 of the conversion optical system 4. Therefore, the light (axial principal ray) reflected by the second reflecting surface 10c is parallel to the optical axis L1 of the conversion optical system 4 and passes through the exit surface 10d.

  The light emitted from the exit surface 10 d enters another optical path bending member 11. This other optical path bending member 11 is a mirror. Another optical path bending member 11 is disposed on the light incident side of the eyepiece 12. Then, the incident light is reflected toward the eyepiece lens 12. Here, the eyepiece 12 is disposed on the opposite side of the conversion optical system 4 with the optical axis L2 interposed therebetween. Therefore, another optical path bending member 11 (its reflection surface) is provided so as to reflect light emitted from the eyepiece lens 12 in a direction away from the optical axis L1 of the conversion optical system 4.

  As described above, the imaging unit main body 1 of the present embodiment includes the conversion optical system 4 inside the main body. For this reason, a large image of the subject can be formed on the entire light receiving unit by the conversion optical system 4. As a result, an element having a large light receiving portion can be used for the image sensor 3. Even in the case of an imaging optical system for an imaging apparatus having a small light receiving unit size, a large image of the subject can be formed by the conversion optical system 4. Therefore, there is an advantage that the existing photographing optical system can be used. In addition, the imaging unit main body 1 of the present embodiment does not have an optical path dividing unit in the imaging unit main body 1. Therefore, the imaging unit body 1 can be thinned.

  In the present embodiment, since the imaging unit main body 1 has the conversion optical system 4, it has a thickness in the optical axis direction. However, since the finder optical system 6 in the present embodiment reflects light emitted from the eyepiece lens in a direction away from the optical axis of the conversion optical system, the finder optical system 6 that can be easily observed can be provided.

  Furthermore, since the finder optical system 6 in this embodiment does not form an intermediate image (referred to as a second intermediate image), the finder optical system 6 is configured with a small number of parts such as two optical path bending members 10 and 11 and an eyepiece 12. Therefore, the configuration of the finder optical system 6 can be simplified.

  Further, in the finder optical system 6 in the present embodiment, the distance from the first intermediate image I ′ to the eye point is shorter than in the case of forming the second intermediate image. However, the light emitted from the eyepiece lens 12 is guided in a direction away from the optical axis L1 of the conversion optical system 4. Therefore, since the photographer can confirm the subject from above the imaging unit main body 1 via the viewfinder, there is no problem in confirming the subject.

  A second embodiment of the present invention will be described. The imaging main body part of 2nd Embodiment is shown in FIG. In addition, the same number is attached | subjected about the same structure as FIG. 1, and the description is abbreviate | omitted. The imaging main body 1 ′ of the present embodiment has a finder optical system 6 ′.

  In the present embodiment, the finder optical system 6 'is an optical system that forms a second intermediate image. Therefore, the finder optical system 6 ′ includes the imaging optical system 13 and the eyepiece 12 as another optical system. The imaging optical system 13 includes a first lens 13a and a second lens 13b.

  Light from the subject travels to the viewfinder optical system 6 'through the optical unit. Then, a first intermediate image I ′ is formed. A first lens 13a is disposed in the vicinity of the first intermediate image I '. The light that has passed through the first lens 13a enters the optical path bending member 10 '. Here, the optical path bending member 10 'is a mirror. The light incident on the optical path bending member 10 'is reflected by the reflection surface.

  At this time, the direction of the reflecting surface of the optical path bending member 10 ′ is set so that the optical axis L 2 of the optical path after bending is parallel to the optical axis L 1 of the conversion optical system 4. Therefore, the light (axial principal ray) reflected by the optical path bending member 10 'is parallel to the optical axis L1 of the conversion optical system 4 and travels toward the second lens 13b. The light incident on the second lens 13 b forms a second intermediate image I ″. Then, the light from the second intermediate image I ″ enters the eyepiece lens 12. Here, the eyepiece 12 is provided so that its optical axis is parallel to the optical axis L <b> 1 of the conversion optical system 4. Another optical system is arranged in the optical path after bending.

  As described above, since the finder optical system 6 ′ forms the second intermediate image I ″, the distance from the first intermediate image I ′ to the eye point is longer than when the second intermediate image I ″ is not formed. Become. Here, as described above, in the present embodiment, the imaging unit main body 1 includes the conversion optical system 4 and thus has a thickness in the optical axis direction. However, since the finder optical system 6 in the present embodiment forms the second intermediate image I ″, the position of the eyepiece 12 can be arranged closer to the back surface of the imaging unit main body 1. Therefore, the finder optical system 6 that is easy to observe. In addition, the optical path bending member 10 ′, the second lens 13b, and the eyepiece 12 can be arranged in series, thereby simplifying the optical path of the finder optical system 6.

  Next, an imaging apparatus is shown in FIG. 3 as a third embodiment. The imaging apparatus 20 according to the present embodiment includes an imaging main body 1 and an optical unit 21. As shown in FIG. 3, the optical unit 21 includes a photographing optical system 22, an optical path dividing unit 23, and a driving mechanism 24. The optical unit 21 is connected to the imaging main body 1 via the detachable part 2. As a result, an image of the subject is formed on the image sensor 3 via the photographing optical system 22 and the conversion optical system 4.

  As a fourth embodiment, another imaging device is shown in FIG. The imaging apparatus 20 ′ of this embodiment includes an imaging main body 1 ′ and an optical unit 21.

  The present invention can take various modifications without departing from the spirit of the present invention.

It is a figure which shows the imaging main-body part in the 1st Embodiment of this invention. It is a figure which shows the imaging main-body part in the 2nd Embodiment of this invention. It is a figure which shows the imaging device in the 3rd Embodiment of this invention. It is a figure which shows the imaging device in the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 'Image pick-up body part 2 Desorption part 3 Image pick-up element 4, Conversion optical system 4a, 4b, Front side lens system 4c Rear side lens system 5 Filter 6, 6' Viewfinder optical system 10 Optical path bending member (prism)
10a Incident surfaces 10b, 10c Reflective surface 10d Incident surface 10 'Optical path bending member (mirror)
DESCRIPTION OF SYMBOLS 11 Mirror 12 Eyepiece 13 Imaging optical system 13a 1st lens 13b 2nd lenses 20, 20 'Image pick-up device 21 Optical unit 22 Shooting optical system 23 Optical path dividing means 24 Drive mechanism I Intermediate image I' 1st intermediate image I "1st 2 intermediate images

Claims (4)

A detachable part from which the optical unit is detachable;
An image sensor;
Conversion optics,
An imaging main body having a finder optical system,
The conversion optical system is an optical system that forms an intermediate image,
The finder optical system has an optical path bending member,
The optical path bending member is provided on the opposite side of the imaging element with the desorption part interposed therebetween,
The direction of the reflecting surface in the optical path bending member is set so that the optical axis of the optical path after bending is parallel to the optical axis of the conversion optical system,
An imaging main body, wherein another optical system is disposed in the optical path after the bending. The another optical system includes another optical path bending member and an eyepiece,
The another optical path bending member is disposed on the light incident side of the eyepiece and is provided so as to reflect the light emitted from the eyepiece in a direction away from the optical axis of the conversion optical system. The imaging main body according to claim 1, wherein The another optical system includes an imaging optical system and an eyepiece,
The imaging optical system is an optical system that forms an intermediate image,
The imaging main body according to claim 1, wherein the eyepiece is provided so that an optical axis thereof is parallel to an optical axis of the conversion optical system.   An imaging apparatus comprising the imaging main body according to any one of claims 1 to 3 and the optical unit.

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