JP2016029415A - Light amount adjusting device and optical instrument using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light amount adjusting device of an imaging apparatus capable of switching to a compact size and two-dimensional imaging and performing parallax adjustment during three-dimensional imaging.SOLUTION: A light amount adjusting device comprises an aperture, a first drive part, and a division diaphragm blade for dividing the aperture into two parts by using the first drive part. When the division diaphragm blade is retracted from the aperture, the aperture becomes one part. When the division diaphragm blade shields the aperture, the aperture becomes two parts. The centers of the two parts of the aperture are movable in accordance with the shielding amount of the aperture of the division diaphragm blade.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light amount adjusting device, and more particularly to a light amount adjusting device for an imaging apparatus.

  As a mainstream method of a conventional three-dimensional imaging apparatus, there is a method of providing two identical optical systems having parallax. Although it can be used as a two-dimensional imaging device by shielding one of the optical systems, there is a problem that the size is increased by two optical systems.

  Patent Document 1 discloses a method of automatically switching between a two-dimensional imaging mode and a two-dimensional imaging mode in conjunction with the attachment / detachment of an optical adapter. In Patent Document 2, by switching between a two-hole type diaphragm that divides the optical path and a normal one-hole type diaphragm, two types of images with parallax can be obtained during the two-hole diaphragm (at the time of focus detection). The focus is adjusted by comparing these images. When the aperture is one hole, the light amount is adjusted during shooting. Such an imaging apparatus has been proposed.

JP 7-274214 A Japanese Patent Registration No. 3919471

  However, with the technique described in Patent Document 1, an increase in size in the optical axis direction is inevitable. By applying the imaging device described in Patent Document 2, it is possible to realize an imaging device that can perform three-dimensional imaging in the case of two-hole aperture and two-dimensional imaging in the case of one-hole aperture. It is difficult to adjust the parallax because the hole shape and interval cannot be changed.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a light amount adjustment device for an image pickup apparatus that can be switched to a small size and two-dimensional image pickup and can adjust parallax at the time of three-dimensional image pickup.

In order to achieve the above object, the configuration of the light amount adjustment device according to the present invention is as follows.
An opening,
A first drive unit;
With divided diaphragm blades that divide the opening into two parts by the first drive unit,
When the divided diaphragm blade is retracted from the opening, the opening becomes one,
When the divided diaphragm blades shield the opening, the opening becomes two,
The centers of the two openings can be moved according to the shielding amount of the openings of the divided diaphragm blades.

  According to the present invention, it is possible to provide a light amount adjustment device for an image pickup apparatus that can be switched to small-sized and two-dimensional imaging and that can adjust parallax during three-dimensional imaging.

It is a figure which shows the state of the aperture blade of the light quantity adjustment apparatus at the time of parallax adjustment at the time of the three-dimensional imaging | photography in Embodiment 1 of this invention (sheet metal non-display). It is sectional drawing of the lens barrel provided with the light quantity adjustment apparatus in Embodiment 1 of this invention. It is a figure which shows the structure inside a lens-barrel provided with the light quantity adjustment apparatus in Embodiment 1 of this invention. It is a block diagram of a camera unit provided with the light quantity adjustment apparatus in Embodiment 1 of this invention. It is a figure which shows the structure inside the light quantity adjustment apparatus in Embodiment 1 of this invention. It is a figure which shows the state of the aperture blade of the light quantity adjustment apparatus at the time of the two-dimensional imaging | photography in Embodiment 1 of this invention. (Sheet metal hidden) It is a figure which shows the state of the aperture blade of the light quantity adjustment apparatus at the time of the light quantity adjustment at the time of the three-dimensional imaging | photography in Embodiment 1 of this invention (sheet metal non-display). It is a figure which shows the structure of the image pick-up element of a camera unit provided with the light quantity adjustment apparatus in Embodiment 1 of this invention. It is a figure which shows the structure to one pixel of the image pick-up element of the camera unit provided with the light quantity adjustment apparatus in Embodiment 1 of this invention. It is a figure which shows the light incidence to one pixel of the image pick-up element of the camera unit at the time of three-dimensional imaging provided with the light quantity adjustment apparatus in Embodiment 1 of this invention. It is a figure which shows the structure inside the light quantity adjustment apparatus in Embodiment 2 of this invention. It is a figure which shows the state of the aperture blade of the light quantity adjustment apparatus at the time of the two-dimensional imaging | photography in Embodiment 2 of this invention (sheet metal non-display). It is a figure which shows the state of the aperture blade of the light quantity adjustment apparatus at the time of parallax adjustment at the time of the three-dimensional imaging | photography in Embodiment 2 of this invention (sheet metal non-display). It is a figure which shows the state of the aperture blade of the light quantity adjustment apparatus at the time of the light quantity adjustment at the time of three-dimensional imaging | photography in Embodiment 2 of this invention (sheet metal non-display). It is a figure which shows the structure inside the light quantity adjustment apparatus in Embodiment 3 of this invention. It is a figure which shows the state of the aperture blade of the light quantity adjustment apparatus at the time of the two-dimensional imaging | photography in Embodiment 3 of this invention (sheet metal non-display). It is a figure which shows the state of the aperture blade of the light quantity adjustment apparatus at the time of parallax adjustment at the time of three-dimensional imaging | photography in Embodiment 3 of this invention (sheet metal non-display).

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Example 1]
FIG. 1 is a view showing a state of a diaphragm blade of a light amount adjusting device at the time of parallax adjustment at the time of three-dimensional imaging in Embodiment 1 of the present invention (sheet metal not shown).

  FIG. 2 is a cross-sectional view of a lens barrel provided with the light amount adjusting device in Embodiment 1 of the present invention. FIG. 3 is a diagram showing a configuration inside the lens barrel including the light amount adjusting device according to the first embodiment of the present invention. This light amount adjusting device is used for a photographing device such as a video camera capable of three-dimensional imaging.

  1 to 3, reference numeral 1 denotes a lens barrel on which the light amount adjusting device of this embodiment is mounted, which is a four-group lens composed of L1 to L4. L1 is a fixed first group lens. L2 is a second lens unit that moves in the optical axis direction and performs a zooming operation. L3 is a fixed third group lens. L4 is a fourth lens group that moves in the optical axis direction and performs a focusing operation.

  Reference numeral 11 denotes a fixed frame that holds the first group lens L1, and is engaged with the fixed frame 12 by a first group fixing screw 11a. Reference numeral 15 denotes a fixed frame for holding the third lens group L3. The light quantity adjusting device 14 of the first embodiment is fixed to the L2 side by a diaphragm fixing screw 14a (not shown) and is sandwiched between the fixed frame 12 and the fixed frame 9. Is engaged.

  Reference numerals 21 and 23 are guide bars, which are fixed so as to be sandwiched between the fixed frame 12 and the fixed frame 9. Reference numeral 22 denotes a guide bar, which is fixed so as to be sandwiched between the fixed frame 12 and the fixed frame 15. Reference numeral 24 denotes a guide bar, which is fixed so as to be sandwiched between the fixed frame 15 and the fixed frame 9. Reference numeral 13 denotes a movable frame that holds the second group lens L2, and is supported by the guide bar 21 so as to be movable in the optical axis direction. Further, the guide bar 22 engages with the U groove 13a on the second group movable frame 13, and the rotation around the guide bar 22 is restricted.

  Reference numeral 16 denotes a movable frame that holds the fourth group lens L4, and is supported by the guide bar 23 so as to be movable in the optical axis direction. In the guide bar 24, the U groove 16a on the fourth group movable frame is engaged, and the rotation around the guide bar 24 is restricted. A zooming stepping motor 17 is fixed to the fixed frame 12 by a fixing screw 17. The screw portion 17a is engaged with a rack 13b fixed to the movable frame 13, and the movable frame 13 moves in the optical axis direction by the rotation of the screw portion 17a.

  Reference numeral 18 denotes a focusing stepping motor which is fixed to the fixed frame 9 by a fixing screw 18a. The screw part 18b is engaged with a rack 16b fixed to the movable frame 16, and the movable frame 16 moves in the optical axis direction by the rotation of the screw part 18b. Reference numeral 19 denotes a unit composed of a photo interrupter and a sheet metal, which is fixed to the fixed frame 9 by a fixing screw 19a. The PI unit 19 is arranged on the second group movable group 13 and controls the position of the second group movable group 13 by the output of the photo interrupter and the rotation speed of the motor.

  Reference numeral 20 denotes a unit composed of a photo interrupter and a sheet metal, and is fixed to the filter switching unit 9 with a fixing screw 20a. The PI unit 20 is disposed on the fourth group movable group 16 and controls the position of the fourth group movable group 16 based on the output of the photo interrupter and the rotational speed of the motor. FIG. 4 is a block diagram of a camera unit including the light amount adjusting device according to the first embodiment of the present invention. In FIG. 4, at the time of shooting, light from the subject passes through the lens group in the lens barrel 1 and enters the image sensor 25 disposed behind the fixed frame 9. The incident light photoelectrically changes to a processing signal 26, passes through the AF gate 27 as a digital signal, and is input to the CPU 55 after performing AF signal processing 28 and the like. The lens units L2 and L4 are moved in the optical axis direction by the stepping motors 17 and 18 based on the signal input to the CPU 29.

  Next, the configuration of the light amount adjusting device 14 will be described. FIG. 5 is a diagram showing an internal configuration of the light amount adjusting device according to the first embodiment of the present invention. FIG. 6 is a diagram showing the state of the diaphragm blades of the light amount adjusting device during two-dimensional imaging according to Embodiment 1 of the present invention (sheet metal not shown).

  The light amount adjusting device 14 includes a sheet metal 30 having an open opening 31, divided diaphragm blades 32 and 35, aperture diaphragm blades 33 and 34, a base member 36, and actuators 37 and 38. The actuator 37 includes an arm 37a, and the arm 37a is driven by energizing the actuator 37. At that time, driving force is applied to the elongated holes 32a and 35a fitted to the protrusions 37b and 37c on the arm 37, and the divided diaphragm blades 32 and 35 slide. When the divided diaphragm blades 32 slide, the rail portions 32b and 32c go straight while being guided by the projections 36d and 36a. When the divided diaphragm blades 35 slide, the rail portions 35b and 35c go straight while being guided by the protrusions 36b and 36c.

  Reference numeral 39 denotes an opening that is formed by the open opening 31, the divided diaphragm blades 32 and 35, and the aperture diaphragm blades 33 and 34 and determines the amount of light finally incident on the image sensor 25. The divided diaphragm blades 32 and 35 are retracted from the opening 39 during two-dimensional imaging, and are shielded so as to divide the opening 39 into two during three-dimensional imaging. By switching the aperture blade, one optical path that normally enters the image sensor 25 is divided into two.

  Next, the light amount adjusting device 14 at the time of two-dimensional imaging will be described. 6A shows an open state where the amount of light incident on the image sensor 25 is not limited, and FIG. 6B shows a state when the amount of light incident on the image sensor 25 is reduced. The actuator 38 includes an arm 38a, and the arm 38a is driven by energizing the actuator 38. At that time, a driving force is applied to the elongated holes 34a and 33a fitted to the protrusions 38b and 38c on the arm 38, and the aperture diaphragm blades 33 and 34 slide. When the aperture diaphragm blade 33 slides, the rail portions 33b and 33c go straight while being guided by the projections 36c and 36b. When the aperture stop blade 34 slides, the rail portions 34b and 34c go straight while being guided by the projections 36a and 36d. Thereby, the amount of light incident on the image sensor 25 is reduced from the state of FIG. 6A as shown in FIG. 6B. By adjusting the amount of straight travel of the aperture diaphragm blades 33 and 34, the size of the opening 39 can be varied.

  Next, the light amount adjusting device 14 at the time of three-dimensional imaging will be described. FIG. 7 is a diagram showing the state of the diaphragm blades of the light amount adjustment device during light amount adjustment during three-dimensional imaging in Embodiment 1 of the present invention (sheet metal not shown).

  The parallax adjustment will be described. FIG. 1 (a) shows a state in which the opening 39 is shielded by the divided diaphragm blades 32 and 35 from the state of FIG. 6 (b) and divided into a first opening 39a and a second opening 39b. In FIG. 1 (b), the center-to-center distance is moved without changing the size of the first opening 39a and the second opening 39b by sliding the divided diaphragm blades 32 and 35 and the aperture diaphragm blades 33 and 34. Indicates the state. FIG. 1 (c) is an enlarged view of the opening of FIG. 1 (b). The alternate long and short dash line portion is the open opening 31.

  Reference numeral 40 denotes a dotted line indicating the opening of FIG. The parallax at the time of three-dimensional imaging can be adjusted without reducing the amount of light by the combination of sliding of four diaphragm blades. The light amount adjustment will be described. In FIG. 7B, the distance from the center of the first opening 39a and the second opening 39b by the sliding of the divided diaphragm blades 32 and 35 and the aperture diaphragm blades 33 and 34 from the state of FIG. The state where the size is changed without changing is shown. FIG. 7 (c) is an enlarged view of the opening of FIG. 7 (b).

  41 is a dotted line which shows the opening part of Fig.7 (a). The light quantity at the time of three-dimensional imaging can be adjusted without changing the parallax by the combination of sliding of the four diaphragm blades. In this way, the light amount adjusting device 14 can adjust the parallax and the light amount.

  Further, the projections 36a and 36d that guide the divided diaphragm blade 32 and the aperture diaphragm blade 34 are a common guide. The projections 36b and 36c for guiding the aperture diaphragm blade 33 and the divided diaphragm blade 35 are also common guides. By doing in this way, the light quantity adjustment apparatus 14 can be reduced in size, and as a result, the lens barrel 1 can be reduced in size.

  The divided diaphragm blades 32 and 35 and the aperture diaphragm blades 33 and 34 are arranged in the order of the divided diaphragm blade 32, the aperture diaphragm blade 33, the aperture diaphragm blade 34, and the divided diaphragm blade 35. Thus, by arranging the convex divided diaphragm blades 32 and 35 apart from each other, when the opening 39 is divided, the blades are prevented from colliding with a minute warp.

  Next, the image sensor 25 will be described. FIG. 8 is a diagram illustrating a configuration of an image sensor of the camera unit including the light amount adjusting device according to the first embodiment of the present invention. FIG. 9 is a diagram showing a configuration of one pixel of the image sensor of the camera unit provided with the light amount adjusting device according to the first embodiment of the present invention.

  FIG. 10 is a diagram showing light incidence on one pixel of the image sensor of the camera unit at the time of three-dimensional imaging provided with the light amount adjusting device in Embodiment 1 of the present invention. The image sensor 25 is configured as shown in FIG. Reference numerals 2511a to 25mna and 311b to 3mnb denote photoelectric conversion units. Here, "one pixel" is configured by 25mn including a pair of photoelectric conversion units 25mna and 25mnb. 25mna and 25mnb are referred to as a first photoelectric conversion unit and a second photoelectric conversion unit, respectively. Note that m represents the number of pixels arranged in the column direction and n represents the number of pixels arranged in the row direction.

  FIG. 9 shows one pixel in FIG. 8 viewed from the direction perpendicular to the optical axis. The pixel 311 includes two photoelectric conversion units 2511a and 2511b. A floating diffusion region (hereinafter referred to as an FD region) and a source follower amplifier, which are conventionally provided for each photoelectric conversion unit, are combined into two photoelectric conversion units. Only two are formed, and two photoelectric conversion regions are connected to the FD region via a MOS transistor switch.

  Accordingly, the charges of the two photoelectric conversion units can be transferred to the FD unit simultaneously or separately, and the addition (synthesis) and non-addition of the signal charges of the two photoelectric conversion units can be performed only at the timing of the transfer MOS transistor connected to the FD region. It can be done easily.

  Using this structure, each of the first output mode for performing photoelectric conversion output by the light beam from the entire exit pupil of the lens barrel 1 and the exit pupil of the lens barrel 1 divided into two by the light amount adjusting device 14 are used. It is possible to switch between the second output mode in which photoelectric conversion output by the light beam is performed.

  In the first output mode in which signals are added at the pixel level, a signal with less noise can be obtained as compared with a method of adding signals after they are read out. By using the image sensor 25 having such a configuration, two-dimensional imaging is performed when the aperture 39 is divided into the first output mode (first output mode), and three-dimensional imaging is performed when the aperture 39 is divided into two (second output mode). Do.

  FIG. 10 is a partial cross-sectional view of the image sensor 25. The lens barrel 1 is located on the left side of the drawing, and the light beam emitted from the lens barrel 1 enters a microlens 42 mn provided for each “one pixel” on the incident surface side of the image sensor 25. Actually, a color filter and wiring are arranged behind the microlens, but are not shown here. The light beam incident on the microlens receives predetermined refraction and reaches the photoelectric conversion units 25mna and 25mnb.

  The power of each microlens is set so that the photoelectric conversion units 25mna and 25mnb in the pixels of the image sensor 25 are projected onto the exit pupil of the lens barrel 1. The lens barrel 1 is preferably a telecentric system so that the incident angle of the chief ray emitted from the pupil to the image sensor 25 is 0 degree in terms of pupil projection accuracy by the microlens. In some cases, the telecentric system may not be available due to the demand for higher ratios. In this case, the microlens and the light receiving unit are slightly decentered, and the amount of decentration may be a function of the distance from the optical axis of the imaging optical system to the photoelectric conversion unit. In general, if the amount of eccentricity is monotonously increased according to the distance, the photoelectric conversion unit around the screen can be correctly projected onto the exit pupil of the lens barrel 1.

  In FIG. 10, a light beam indicated by a solid line is a light beam incident on the first photoelectric conversion unit 25mna, and a light beam indicated by a broken line is a light beam incident on the second photoelectric conversion unit 25mnb. Therefore, the light beam incident on the second photoelectric conversion unit 25mnb in the entire image pickup device 25 is a light beam that passes through the upper half of the exit pupil of the lens barrel 1 (the left half in FIG. 1A).

  On the other hand, the light beam incident on the entire first photoelectric conversion unit 25mna of the image pickup device 25 may be considered as being inverted up and down with the lens barrel 1 as the axis of symmetry, so the lower half of the exit pupil of the lens barrel 1 is The light beam passes through. The right half in Fig. 1 (a)).

  In the image pickup system as described above, for example, when an object image is formed in front of the image pickup element 25, the half light beam passing above the exit pupil is shifted downward on the image pickup element 25 in FIG. The half light flux that passes under the pupil shifts upward. In other words, the phase of the pair of image signals formed by the light beam that passes through each half of the pupil of the lens barrel 1 is shifted in the vertical direction (in the horizontal direction in FIG. 1 (a)) according to the imaging state of the object image. Will be.

  As described above, when the optical path is divided into two by the opening 39, two images having a phase shift amount formed on the image sensor 25 can be formed, and a three-dimensional image can be created by combining them. Become.

[Example 2]
Compared to the first embodiment, the lens barrel 1 has the same configuration except for the light amount adjusting device 14, and thus the description thereof is omitted.

  FIG. 11 is a diagram illustrating an internal configuration of the light amount adjusting apparatus according to the second embodiment of the present invention. FIG. 12 is a diagram showing the state of the diaphragm blades of the light amount adjusting device during two-dimensional imaging in Embodiment 2 of the present invention (sheet metal not shown).

  The light amount adjusting device 43 includes a sheet metal 44 having an open opening 45, a divided diaphragm blade 48, an aperture diaphragm blade 46, an aperture diaphragm blade 47, a base member 49, an actuator 50, and an actuator 51. The actuator 50 includes an arm 50a. When the actuator 50 is energized, the arm 50a is driven. At that time, a driving force is applied to the long hole portion 48a fitted to the protruding portion 50b on the arm 50a, and the divided diaphragm blade 48 slides. When the divided diaphragm blades 48 slide, the rail portions 48b and 48c go straight while being guided by the projections 49b and 49c. Reference numeral 52 denotes an opening that is formed by the open opening 45, the divided diaphragm blade 48, and the aperture diaphragm blades 46 and 47 and determines the amount of light finally incident on the image sensor 25.

  The divided diaphragm blade 48 is retracted from the opening 52 during two-dimensional imaging, and is shielded so as to divide the opening 39 into two during three-dimensional imaging. By switching the aperture blade, one optical path that normally enters the image sensor 25 is divided into two.

  Next, the light amount adjustment device 43 during two-dimensional imaging will be described. FIG. 12 shows a state when the amount of light incident on the image sensor 25 is reduced. The actuator 51 includes an arm 51a, and the arm 51a is driven by energizing the actuator 51. At that time, a driving force is applied to the elongated holes 47a and 46a fitted to the protrusions 51b and 51c on the arm 51, and the aperture diaphragm blades 46 and 47 slide. When the aperture diaphragm blade 46 slides, the rail portions 46b and 46c go straight while being guided by the protrusions 49c and 49b. When the aperture diaphragm blade 47 slides, the rail portions 47b and 47c go straight while being guided by the projections 49a and 49d. By adjusting the amount of straight travel of the aperture diaphragm blades 46 and 47, the size of the opening 39 can be varied.

  Next, the light amount adjusting device 43 at the time of three-dimensional imaging will be described. FIG. 13 is a diagram showing the state of the diaphragm blades of the light amount adjusting device during parallax adjustment during three-dimensional imaging according to Embodiment 2 of the present invention (sheet metal not shown).

  FIG. 14 is a diagram showing the state of the diaphragm blades of the light amount adjusting device during light amount adjustment during three-dimensional imaging in Embodiment 2 of the present invention (sheet metal not shown).

  The parallax adjustment will be described. FIG. 13A shows a state in which the opening 52 is shielded by the divided diaphragm blade 48 from the state of FIG. 12 and is divided into two parts, a first opening 52a and a second opening 52b. FIG. 13B shows a state in which the distance from the center is moved without changing the size of the first opening 52a and the second opening 52b by sliding the divided diaphragm blade 48 and the aperture diaphragm blades 47, 48. Indicates. FIG.13 (c) is an enlarged view of the opening part of FIG.13 (b). The alternate long and short dash line portion is an open opening 45. 53 is a dotted line which shows the opening part of Fig.13 (a). The parallax during three-dimensional imaging can be adjusted without reducing the amount of light by combining four sliding blades.

The light amount adjustment will be described. In FIG. 14B, the distance between the centers of the first opening 52a and the second opening 52b is not changed by the sliding of the divided diaphragm blades 48 and the aperture diaphragm blades 46 and 47 from the state of FIG. 14A. The state where the size is changed is shown. FIG. 14 (c) is an enlarged view of the opening of FIG. 14 (b).
54 is a dotted line showing the opening of FIG. The light quantity at the time of three-dimensional imaging can be adjusted without changing the parallax by the combination of sliding of the four diaphragm blades. Thus, the light quantity adjusting device 43 can adjust the parallax and the light quantity.

  Further, the projections 49b and 49d for guiding the divided diaphragm blade 48 and the aperture diaphragm blade 47 are a common guide. By doing in this way, the light quantity adjustment apparatus 43 can be reduced in size, and as a result, the lens barrel 1 can be reduced in size.

[Example 3]
Compared to the first embodiment, the lens barrel 1 has the same configuration except for the light amount adjusting device 14, and thus the description thereof is omitted. FIG. 15 is a diagram showing an internal configuration of the light amount adjusting apparatus according to Embodiment 3 of the present invention. FIG. 16 is a diagram showing the state of the diaphragm blades of the light amount adjusting device during two-dimensional imaging according to Embodiment 3 of the present invention (sheet metal not shown).

  The light amount adjusting device 55 includes a sheet metal 56 having an opening 57, a divided diaphragm blade 58, a base member 59, and an actuator 60. The actuator 60 includes an arm 60a, and the arm 60a is driven by energizing the actuator 60. At that time, a driving force is applied to the elongated hole 58a fitted to the protrusion 60b on the arm 60a, and the divided diaphragm blade 58 slides. When the divided diaphragm blades 58 slide, the rail portions 58b and 58c go straight while being guided by the projections 59b and 59c.

  The divided diaphragm blade 58 is retracted from the opening 57 during two-dimensional imaging, and is shielded so as to divide the opening 57 into two during three-dimensional imaging. By switching the aperture blade, one optical path that normally enters the image sensor 25 is divided into two.

  Next, the light amount adjusting device 55 at the time of two-dimensional imaging will be described. FIG. 16 shows the state of the opening at the time of two-dimensional imaging, and the light amount adjusting device 55 is a fixed stop with a constant aperture system. Therefore, the divided diaphragm blade 58 is always retracted from the two-dimensional opening 57 during two-dimensional imaging. Next, the light amount adjustment device 55 at the time of three-dimensional imaging will be described.

  FIG. 17 is a diagram showing the state of the diaphragm blades of the light amount adjusting device during parallax adjustment during three-dimensional imaging according to Embodiment 3 of the present invention (sheet metal not shown).

  The parallax adjustment will be described. FIG. 17A shows a state in which the opening 57 is shielded by the divided diaphragm blade 58 from the state of FIG. 16 and is divided into two parts, a first opening 57a and a second opening 57b. FIG. 17B shows a state in which the distance from the center of the first opening 57a and the second opening 57b is moved by the sliding of the divided diaphragm blades 58. FIG. 17 (c) is an enlarged view of the opening of FIG. 17 (b). The alternate long and short dash line portion is the opening 57.

  61 is a dotted line which shows the opening part of Fig.17 (a). Unlike the first and second embodiments, the amount of light is variable, but the parallax during three-dimensional imaging can be adjusted by the divided diaphragm blades 58.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

14 light quantity adjusting device, 32 divided diaphragm blades (first), 33 first aperture diaphragm blades,
34 second aperture diaphragm blade, 35 divided diaphragm blade (second),
37 actuator (first drive unit), 39 opening (during 2D imaging),
39a First opening (during 3D imaging), 39b Second opening (during 3D imaging)

Claims (4)

An opening,
A first drive unit;
With divided diaphragm blades that divide the opening into two parts by the first drive unit,
When the divided diaphragm blade is retracted from the opening, the opening becomes one,
When the divided diaphragm blades shield the opening, the opening becomes two,
A light amount adjusting device in which the centers of the two openings can move depending on the shielding amount of the openings of the divided diaphragm blades. The opening is a second driving unit disposed;
Having first and second aperture diaphragm blades that slide by the second drive unit,
The light amount adjusting device according to claim 1, wherein the size of the opening can be varied by the two aperture diaphragm blades. The light quantity adjusting device according to claim 2, wherein at least the one aperture diaphragm blade and the divided diaphragm blade slide along a common protrusion. The divided diaphragm blade is composed of two pieces, a first divided diaphragm blade and a second divided diaphragm blade,
4. The light amount adjusting device according to claim 2, wherein each of the first and second divided diaphragm blades is disposed outside the aperture diaphragm blade in the optical axis direction. 5.