JP2009175608A - Imaging body and imaging device having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging body for using a thin imaging element with a large light receiving element, and to provide an imaging device having the same. <P>SOLUTION: An imaging body (1) includes: an attach/detach portion (2) to which an imaging optical system 10 is detachably attached; optical path division means (3); an imaging element (4); and a conversion optical system (5, 5'). The conversion optical system (5, 5') is formed by a front lens system (5a, 5c, 5d) and a rear lens system. The imaging body includes a first moving mechanism 6 for moving the optical path division means between a first position and a second position; and a second moving means 9 for moving the front lens system (5a, 5c, 5d) between the first position and a third position. <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 unit that can use an imaging device having a large size as a light receiving unit while being thin, and an imaging main body unit thereof An imaging device is provided.

  An imaging main body of the present invention that achieves the above object is an imaging main body having a detachable part from which a photographic optical system is attached, an optical path dividing means, an image sensor, and a conversion optical system, wherein the conversion optical system Comprises a front lens system and a rear lens system, a first moving mechanism for moving the optical path splitting means between a first position and a second position, and the front lens system as a first position and a third position. A second moving mechanism that moves the head at a position of

  The second moving mechanism moves the front lens system to the first position when the optical path dividing means moves to the second position.

  Further, the conversion optical system is an optical system that does not form an intermediate image inside the imaging body.

  Further, the conversion optical system is an optical system that forms an intermediate image inside the imaging body.

  In addition, an imaging apparatus according to the present invention includes the above-described imaging main body and the imaging optical system.

  According to the above-described present invention, it is possible to obtain an imaging main body unit that can use an imaging element having a large light receiving portion while being thin, and an imaging device including the imaging body unit.

  An embodiment of the present invention will be described. The imaging main body part of this embodiment is shown in FIG. In FIG. 1, the imaging main body 1 includes a detachable part 2, an optical path dividing means 3, an imaging element 4, a conversion optical system 5, a first moving mechanism 6, a finder optical system 7, and a second movement. It has a mechanism 9. The detachable part 2 is, for example, a bayonet ring. The taking optical system can be attached / detached through the attaching / detaching portion 2.

  The optical path dividing means 3 is, for example, a mirror (quick return mirror). This mirror can be moved to a first position and a second position by a drive mechanism 6. The first position is a position indicated by a solid line. This first position is between the detachable part 2 and the image sensor 4. The second position is a position indicated by a broken line. The second position is a position obtained by rotating the optical path dividing means 3 at the first position by 45 degrees and is a position in the vicinity of the finder optical system 7.

  The image sensor 4 is disposed on the opposite side of the detachable portion 2 with the first position interposed therebetween. This position is a position where an image of the subject is formed when the photographing optical system is attached. In the present embodiment, a filter 8 is disposed in front of the image sensor 4.

  The conversion optical system 5 is disposed between the attachment / detachment unit 2 and the image sensor 4. The conversion optical system 5 includes a front lens system 5a and a rear lens system 5b. Here, the front lens system 5a is disposed in the vicinity of the first position. On the other hand, the rear lens system 5 b is disposed between the optical path dividing means 3 (first position) and the image sensor 4.

  The imaging main body of the present embodiment includes a second moving mechanism 9. The second moving mechanism 9 of k is for moving the front lens system 5a. By this second moving mechanism 9, the optical path dividing means 3 can be moved to the first position and the third position. Here, the third position is a position where the front lens system 5a is retracted. As the retreat position, for example, there is a bottom surface portion of the imaging main body 1. Note that a moving mechanism, a rotating mechanism, or both mechanisms can be used for retraction.

  In this embodiment, one of the optical path dividing means 3 and the front lens system 5a moves to the first position. FIG. 1 shows a state where the optical path dividing means 3 has moved to the first position. In this case, the front lens system 5a has moved to the retracted position in order to avoid contact (collision) of the optical path dividing means 3. On the other hand, FIG. 2 shows a state where the optical path dividing means 3 has moved to the second position. In this case, the front lens system 5a has moved to the first position.

  Thus, the imaging unit main body 1 of the present embodiment includes the conversion optical system 5 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 5. As a result, an element having a large light receiving portion can be used for the image sensor 4. In addition, a second moving mechanism 9 for moving the front lens system 5a is provided. Thereby, the first position can be shared by the optical path dividing means 3 and the front lens system 5a. As a result, the imaging unit body 1 can be thinned.

  Even in the case of a photographing optical system for an imaging device having a small light receiving unit size, a large image of the subject can be formed by the conversion optical system 5. Therefore, there is an advantage that the existing photographing optical system can be used.

  The front lens system 5a preferably has a negative refractive power. On the other hand, the rear lens system 5b preferably has a positive refractive power. By doing so, a large image of the subject can be formed. In FIG. 1, each of the front lens system 5a and the rear lens system 5b is a single lens. However, the front lens system 5a and the rear lens system 5b may each be composed of a plurality of lenses.

  The conversion optical system 5 is an optical system that does not form an intermediate image (primary image). In this way, the optical system can be thinned and the imaging main body 1 can be thinned.

  Another example of the conversion optical system is shown in FIG. The conversion optical system 5 ′ is disposed between the attachment / detachment unit 2 and the image sensor 4. The conversion optical system 5 'includes front lens systems 5c and 5d and a rear lens system 5e. The front lens systems 5c and 5d have a positive refractive power as a whole. Further, the rear lens system 5e has a positive refractive power as a whole.

  The optical path dividing means 3 is movable to the positions of the front lens systems 5c and 5d. Therefore, at least one of the front lens systems 5c and 5d is configured to be movable to the retracted position. In FIG. 3, the optical path dividing means 3 moves to the position of the lens 5d. Therefore, the lens 5d can be moved to the retracted position.

  Here, the front lens systems 5c and 5d include a lens 5c having a positive refractive power disposed in the vicinity of the intermediate image and a lens 5d having another positive refractive power. Since the lens 5c is disposed near the intermediate image, it functions as a field lens.

  The conversion optical system 5 ′ is an optical system that forms an intermediate image (primary image). In this way, an image with less aberration can be obtained even when the image of the subject is enlarged.

  Next, the imaging apparatus 11 of this embodiment is shown in FIG. The imaging apparatus 11 according to the present embodiment includes an imaging main body 1 and a photographing optical system 10. The imaging device 9 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 4 via the photographing optical system 9 and the conversion optical system 5.

  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, Comprising: The case where an optical path division | segmentation means exists in a 1st position is shown. It is a figure which shows the imaging main-body part in the 1st Embodiment of this invention, Comprising: The case where a front side lens system exists in a 1st position is shown. It is a figure which shows another structure of a conversion optical system. It is a figure which shows the imaging device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging main-body part 2 Desorption part 3 Optical path division | segmentation means 4 Imaging element 5, 5 'Conversion optical system 5a, 5c, 5d Front side lens system 5b, 5e Rear side lens system 6 First moving mechanism 7 Viewfinder optical system 8 Filter 9 First 2 moving mechanism 10 photographing optical system 11 imaging device

Claims (5)

A detachable part from which the photographic optical system is detachable;
Optical path dividing means;
An image sensor;
An imaging body having a conversion optics system,
The conversion optical system includes a front lens system and a rear lens system,
A first moving mechanism for moving the optical path splitting means between a first position and a second position;
An imaging main body having a second moving mechanism for moving the front lens system between the first position and the third position.   2. The imaging main body according to claim 1, wherein when the optical path dividing unit moves to the second position, the second moving mechanism moves the front lens system to the first position.   The imaging main body according to claim 1, wherein the conversion optical system is an optical system that does not form an intermediate image inside the imaging main body.   The imaging main body according to claim 1, wherein the conversion optical system is an optical system that forms an intermediate image inside the imaging main body.   An imaging apparatus comprising the imaging main body according to any one of claims 1 to 4 and the imaging optical system.

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