JP2001075162A - Photographing lens device for electronic camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easily producible a photographing lens device, to improve the productivity and to make maintainable high optical performance by assembling plural blocks or units capable of relatively being positioned and fixed. SOLUTION: A 1st optical unit 20 where a 1st group lens is fixed in a front lens frame 2 takes in luminous flux from a subject along a 1st optical axis OA1 (horizontal direction) and is movably held in an optical axis changing unit 30. The unit 30 is fixed on a 2nd optical unit 80, reflects the luminous flux passing through the 1st group lens by a mirror 33 and bends it by 90 deg. along a 2nd optical axis OA2 (vertical direction). A light quantity adjusting unit 50 is fixed on the unit 80, and a shutter and a diaphragm are disposed on the unit 50. In the unit 80, a 2nd group lens is fixed in a rear lens frame 82, and is arranged so that the luminous flux reflected along the 2nd optical axis OA2 and passing through the aperture of the unit 50 may be formed into an image on a CCD 92.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing lens device for an electronic camera which constitutes a bending optical system.

[0002]

2. Description of the Related Art In an electronic camera using a photoelectric conversion image pickup device such as a CCD device, there is no restriction on a film unlike a silver halide film camera, so that it is easy to refract an image pickup optical axis in the middle. Therefore, an electronic camera or a VTR in which the thickness direction is reduced by mounting a bending optical system provided with an optical axis conversion unit such as a mirror in the middle of the taking lens optical system has been proposed. For example, in a VTR disclosed in Japanese Patent Application Laid-Open Nos. 9-163206 and 9-281578, a photographing lens unit that constitutes a bending optical system is disposed on the front surface of a VTR mechanism unit in order to reduce the size of the VTR. You.

[0003]

In recent years, electronic cameras have been required to be further miniaturized, and with the spread of electronic cameras, it has become necessary to improve productivity and reduce costs. .

When a bending optical system is employed, the photographing lens section includes an optical axis converting means, for example, a first component group provided on an imaging optical axis (first optical axis) before bending by a mirror, and an optical axis converting means. Imaging optical axis (second
And a second component group provided on the optical axis). In order to realize a high-performance imaging lens unit, the first component group must be arranged on the first optical axis with high accuracy, and the second component group on the second optical axis must be arranged with high accuracy. . In addition, it is necessary that the optical relative relationship between the first and second component groups be set accurately.

In the case of a photographic lens unit constituting a linear optical system for a silver halide camera, it is relatively easy to fix each part while maintaining optical accuracy. But,
In the case of a photographic lens unit of a bending optical system, it is not so easy to fix each part while accurately maintaining the angular relationship between the first and second parts. This difficulty increases as the size of the taking lens unit decreases. If a camera is manufactured using a manufacturing process involving such difficulties, it is difficult to improve productivity and reduce costs.

The above-mentioned Japanese Patent Application Laid-Open No. 9-281578 also discloses
A mounting cylinder including a part on the first optical axis and a part of a component on the second optical axis; and a lens holding member including a component on the second optical axis, wherein the mounting cylinder is arranged with respect to the lens holding member. An imaging lens unit configured to be rotatable is disclosed. However, it is not easy to create an optically high-performance imaging system with a photographic lens unit having such a rotary mounting cylinder, and this tendency becomes more remarkable as the number of components on the first optical axis increases. become.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and in a photographic lens unit for an electronic camera constituting a folding optical system, the productivity is improved by facilitating the production and the high optical lens. The purpose is to be able to maintain the dynamic performance.

[0008]

SUMMARY OF THE INVENTION A first aspect of the present invention is as follows.
In a photographing lens device for an electronic camera, a first group lens for taking in a light beam from a subject along a first optical axis, and holding the first group lens and adjusting the first group lens for focus adjustment Holding means for moving parallel to the first optical axis, and optical axis converting means for bending a light beam passing through the first group lens along a second optical axis intersecting the first optical axis And a positioning unit for fixing the first block at a predetermined position, and a light beam bent along the second optical axis by the optical axis conversion unit with respect to an image sensor. Second for imaging
And a second block that is attached to the camera housing and has a group lens.

According to a second aspect of the present invention, in the photographing lens device for an electronic camera according to the first aspect, the second block is provided for a light beam bent along the second optical axis by the optical axis converting means. Light amount adjusting means for mechanically adjusting the aperture, a lens frame holding the second group lens,
Wherein the light amount adjusting means and the lens frame are separable from each other.

According to a third aspect of the present invention, in the photographing lens device for an electronic camera according to the first aspect, the second optical axis is provided between the first block and the second block by the optical axis converting means. Light amount adjusting means for mechanically adjusting the opening for the light beam bent along the line is provided.

According to a fourth aspect of the present invention, there is provided a photographing lens apparatus for an electronic camera, wherein a first optical unit having a first group lens for taking in a light beam from a subject along a first optical axis; An optical axis, comprising: holding means for holding one optical unit; and optical axis converting means for bending a light beam passing through the first group lens along a second optical axis intersecting the first optical axis. A conversion unit, a light amount adjustment unit having a light amount adjustment unit for mechanically adjusting an opening for the light beam bent along the second optical axis by the optical axis conversion unit, and imaging the light beam passing through the opening A second optical unit having a second group lens for forming an image on an element, and the optical axis conversion unit and the second optical unit are coupled to each other so as to sandwich the light amount adjustment unit therebetween. Characterized by comprising a coupling means of fit.

According to a fifth aspect of the present invention, in the photographic lens apparatus for an electronic camera according to the fourth aspect, the light amount adjusting unit includes a diaphragm means for adjusting a diameter of the opening, and a light shielding unit for shielding the opening. And shutter means.

According to a sixth aspect of the present invention, there is provided a photographing lens device for an electronic camera according to any one of the first to fifth aspects.
The optical axis conversion means includes a reflection means for reflecting a light beam.

[0014]

1 and 2 are a front view and a plan view, respectively, showing an electronic camera incorporating a photographic lens device according to an embodiment of the present invention.

As shown in FIGS. 1 and 2, an operation ring 14 and a strobe 15 of an optical system are provided on the front side of a housing 11 of the electronic camera, and a release button 16 is provided on the upper side. In addition, a liquid crystal (LCD) panel 17 is provided on the rear side of the housing 11, and is used for displaying a captured image or a reproduced image on the rear surface of the housing 11. Further, a battery 18 serving as a power source of the internal system is disposed inside the left side of the housing 11.

A photographic lens device 12 is provided in a housing 11 so that an optical axis for taking in a light flux from a subject is aligned with the center of an operation ring 14. As shown in FIG. 3, the photographing lens device 12 takes in a light beam from a subject along a horizontal first optical axis OA1 from the lenses 24a and 24b, and converts the light beam into a second vertical light beam by an optical axis converting means such as a mirror 33. Axis O
After bending at 90 ° along A2, a bending optical system that forms an image on a photoelectric conversion image sensor such as a CCD 92 is configured. The photographic lens device 12 is configured by assembling a first optical unit 20, an optical axis conversion unit 30, a light amount adjustment unit 50, and a second optical unit 80, which are created as separate units.

FIGS. 4 to 6 are views showing the photographing lens device 12 in an assembled or disassembled state, and are specifically described as follows.

FIG. 4 shows the photographing lens device 12.
(A) Unit 20, 30, 50, 80 assembled, (b) Unit 20, 30 and unit 50, 8
It is a front view showing the state disassembled into 0, and (c) the state disassembled into the unit 20, 30, the unit 50, and the unit 80, respectively. FIGS. 5A to 5C show FIGS.
It is a side view corresponding to (c), respectively.

FIG. 6 shows the photographing lens device 12.
(A) a state in which the units 20, 30, 50, and 80 are all assembled; (b) a state in which the units 20, 30 are assembled;
FIG. 3C is a plan view showing (c) a state where the units 50 and 80 are assembled, (d) a unit 50 alone, and (e) a unit 80 alone.

The first optical unit 20 has a ring-shaped front lens frame 22 in which first group lenses 24a and 24
b is fixed (see FIG. 3). First group lens 24a, 2
4b is arranged to take in a light beam from the subject along the first optical axis OA1 (oriented in the horizontal direction).

Flanges 26 are provided on both sides of the front lens frame 22, respectively.
27 (see FIG. 6 (a)), a female screw portion and a bearing hole are provided in the upper and lower portions of the flange 26, and a bearing hole is provided in the flange 27. These flanges 26, 27
Is attached to a horizontal screw shaft 35 and two guide shafts 36 and 37 disposed in the optical axis conversion unit 30 in a manner described later (see FIG. 4A), whereby the first optical unit 20 Are movably held by the optical axis conversion unit 30.

The optical axis conversion unit 30 is positioned at 45 ° with respect to the first and second optical axes OA1 and OA2 of the photographing lens device 12.
And a mirror 33 serving as a reflection means, that is, an optical axis conversion means, is adhered to the 45 ° inclined surface of the mirror frame 32 (see FIG. 5B). . The luminous flux passing through the first group lenses 24a and 24b is
The light is reflected by the mirror 33 and is bent by 90 ° along the second optical axis OA2 (aligned in the vertical direction).

The optical axis conversion unit 30 is also provided with a rotating motor 34 for AF (auto focus) (see FIG. 6A). The screw shaft 35 of the AF motor 34 extends in parallel with the first optical axis OA1, and a male screw portion at the tip thereof is a female screw portion disposed above the flange 26 of the front lens frame 22 of the first optical unit 20. To screw. Therefore, the front lens frame 22 is moved back and forth with the rotation of the shaft 35. The optical axis conversion unit 30 has a first optical axis O
Two guide shafts 36, 37 parallel to A1 are arranged, which correspond to the corresponding flanges 26,
27 are respectively inserted into bearing holes provided. That is, A
By driving the F motor 34, the front lens frame 22 is moved along with the first group lenses 24a and 24b along the shafts 36 and 37 into the first lens frame.
It is moved in parallel to the optical axis OA1, whereby focus adjustment is performed.

Three legs 38 are provided below the mirror frame 32, and pins 39 are attached to the bottom of each of the two legs 38 (see FIG. 5B). The pins 39 are attached to holes 87 formed at two places on the upper surface of the second optical unit 80 in a manner described later, whereby the optical axis conversion unit 30
Is fixed at a predetermined position on the second optical unit 80.

The light amount adjusting unit 50 has a flat frame 52 in which an opening 53 for passing the light beam bent along the second optical axis OA2 by the mirror 33 is formed (see FIG. 6D). The frame 52 is set to have the same thickness as the height of the leg 38 of the optical axis conversion unit 30. In order to open and close the opening 53 and adjust the opening area,
A shutter means 54 and an aperture means 64 are disposed on the frame 52 facing the opening 53 (see FIG. 3). Shutter means 54
While a plunger 56 is disposed above the frame 52 to drive the diaphragm 52 (see FIG. 6D), a stepping motor 66 is disposed below the frame 52 to drive the aperture means 64 (see FIG. 6D). 4 (c)).

The shutter means 54 is configured to open and close with the rotation of an L-shaped rotary lever 62 supported by a frame 52 so as to be rotatable about a shaft 61 (see FIG. 6D). One arm of the rotating lever 62 is connected to the shutter means 54, and the other arm is sandwiched between a pair of flanges 58a, 58b attached to the iron core 57 of the plunger 56.
The plunger 56 of the shutter means 54 is constituted by a solenoid coil for moving the iron core 57 back and forth at high speed. A coil spring 59 is mounted on the iron core 57 between the motor and the flange 58b. Accordingly, the rotating lever 62 is rotated by the high-speed reciprocating movement of the iron core 57 of the plunger 56, and the shutter means 54 is opened and closed.

An engagement recess 68 is formed on the upper surface of the frame 52 of the light quantity adjusting unit 50, and a hole 69 is formed at one position on the lower surface. In addition, a ring-shaped concave portion 53a is formed on the lower surface of the frame 52 so as to surround the opening 53 (FIG. 4).
(C)). The engagement recess 68, the hole 69, and the recess 53a
In a manner to be described later, the hook engages with the hook 88, the pin 89, and the projection 85 provided on the upper surface of the second optical unit 80, whereby the light amount adjustment unit 50 is positioned at a predetermined position on the second optical unit 80. Fixed. Further, rectangular cutouts 67 are formed in the frame 52 at three places around the frame 52 so as to correspond to the three legs 38 of the mirror frame 32 of the optical axis conversion unit 30 and escape therefrom. (D)).

The second optical unit 80 includes one
2 has a cylindrical rear lens frame 82,
The second group lenses 84a to 84d are fixed in the lens 2 (FIG. 3).
reference). The second group lenses 84a to 84d transmit the light flux reflected by the mirror 33 along the second optical axis OA2 (vertical direction) and passing through the opening 53 of the light amount adjustment unit 50 to the photoelectric conversion image sensor, that is, the CCD 92. It is arranged to form an image.

At the top of the rear mirror frame 82, there is provided a flat upper frame 83 having an opening 84 for allowing the light beam bent along the second optical axis OA2 by the mirror 33 to pass therethrough. 6 (e)). On the upper surface of the upper frame 83, 2
A hole 87, a hook 88 and a pin 89 are provided at the location. A ring-shaped convex portion 85 is provided around the opening 84 on the upper surface of the upper frame 83 (see FIG. 4C). The hole 87 is engaged with the pin 39 of the optical axis conversion unit 30, the convex portion 85 is fitted into the concave portion 53 a of the light amount adjusting unit 50, and the pin 89 is engaged with the hole 69 of the light amount adjusting unit 50. The optical axis conversion unit 30 and the light amount adjustment unit are fixed at predetermined positions on the second optical unit 80. Further, the hook 88 is engaged with the engaging concave portion 68 of the light amount adjusting unit 50, thereby preventing the light amount adjusting unit 50 from dropping off.

When assembling the photographic lens device 12 having the above-described configuration, first, the first optical unit 20 is attached to the optical axis conversion unit 30. This operation is performed by the flanges 26 and 27 of the front lens frame 22 of the first optical unit 20.
The shafts 35, 36, 37 of the optical axis conversion unit 30
Can be carried out. Thus, the first optical unit 20 and the optical axis conversion unit 30
Assemble the first block consisting of

On the other hand, the engaging recess 6 of the light amount adjusting unit 50
8, the light amount adjusting unit 50 is fixed on the second optical unit 80 by engaging the hook 88, the pin 89, and the convex portion 85 of the second optical unit 80 with the hole 69, the concave portion 53a. Thus, the second block including the light amount adjustment unit 50 and the second optical unit 80 is assembled.

Next, the first block including the first optical unit 20 and the optical axis conversion unit 30 is attached to the second block including the light amount adjusting unit 50 and the second optical unit 80. At this time, the optical axis conversion unit 30 is connected to the second optical unit 80 such that the light amount adjustment unit 50 is interposed therebetween.
To be combined. That is, the optical axis conversion unit 30 is fixed on the second optical unit 80 by inserting the pin 39 at the bottom of the leg 38 of the optical axis conversion unit 30 into the hole 87 of the second optical unit 80.

Since the frame 52 is set to have the same thickness as the height of the leg 38 of the optical axis conversion unit 30, the light amount adjustment unit 50 is provided between the optical axis conversion unit 30 and the second optical unit 80. Is pinched in close contact. Therefore, the optical axis conversion unit 30, the light amount adjustment unit 50,
The relative positional relationship between the second optical unit 80 and the second optical unit 80 in the vertical direction is further fixed.

Next, the photographing lens device 12 thus assembled is fixed to the camera housing 12. In addition, CCD
92 can be attached to the second optical unit 80 after or during the assembling of the taking lens device 12.

In a state where the photographing lens device 12 is assembled, the first optical unit 20 and the optical axis conversion unit 30
Is a single block, so that the movable first group lenses 24a and 24b and the mirror 3
3 is reliably maintained, and good image quality is assured. In a state where the photographing lens device 12 is assembled, the units 20, 30, 50,
Since the lens 80 is substantially integrated, the first group lens 24
a, 24b, a mirror 33 serving as an optical axis converting means,
The optical relationship of the three lenses with the group lenses 84a to 84d is also reliably maintained, and good image quality is guaranteed.

Further, since the units 20, 30, 50, and 80 are individually formed and can be disassembled as needed after assembling, manufacturing, assembling, and
Work such as inspection becomes easier. Also, the first group lens 24
Since a and 24b can be moved for focus adjustment, it is advantageous for close-up photography (macro photography). Further, since the shutter means 54 and the aperture means 64 of the light amount adjustment unit 50 are disposed near the mirror 33 of the optical axis conversion unit 30, the size of the mirror 33 can be reduced, which is advantageous in reducing the size of the entire photographing lens device 12. Becomes

In the above embodiment, the light amount adjusting unit 50 is disposed between the optical axis conversion unit 30 and the second optical unit 80. However, the light amount adjusting unit 50 is It is also possible to relocate before. Further, in the above-described embodiment, the light amount adjustment unit 50 is configured as an independent unit. However, the light amount adjustment unit 50 and the second optical unit 80 may be configured as an integrated unit from the beginning, or The adjusting means (shutter means 54 and diaphragm means 64) can be provided as a part of the second optical unit 80.

[0038]

According to the present invention, the photographing lens device for the electronic camera constituting the bending optical system is constructed by assembling a plurality of blocks or units that can be relatively positioned and fixed. Manufacturing becomes easy, productivity is improved, and high optical performance can be maintained.

[Brief description of the drawings]

FIG. 1 is a front view showing an electronic camera incorporating a photographic lens device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the electronic camera shown in FIG. 1;

FIG. 3 is a side view showing the inside of the electronic camera shown in FIG. 1 and the optical system of the photographing lens device.

FIG. 4 shows (a) 4 in the photographing lens device shown in FIG.
A state where all three units are assembled, (b) a state where the first optical unit and the optical axis conversion unit are disassembled into a light amount adjustment unit and a second optical unit, and (c) a first optical unit and an optical axis conversion unit. FIG. 6 is a front view showing a state where the light amount adjusting unit and the second optical unit are disassembled.

5A to 5C are side views corresponding to FIGS. 4A to 4C, respectively.

FIG. 6 shows the photographing lens device shown in FIG.
(B) a state in which the first optical unit and the optical axis conversion unit are assembled, (c) a state in which the light amount adjustment unit and the second optical unit are assembled,
It is a top view which respectively shows (d) light amount adjustment unit only, and (e) 2nd optical unit alone.

[Explanation of symbols]

 11: Camera housing 12: Photographing lens device 20: First optical unit 22: Front mirror frame 24a, 24b: First group lens 30: Optical axis conversion unit 32: Mirror mirror frame 33: Mirror 34: AF motor 35: Motor Shafts 36 and 37: Guide shaft 38: Leg 39: Pin 50: Light amount adjustment unit 52: Frame of light amount adjustment unit 53: Opening 53a: Ring-shaped recess 54: Shutter means 56: Motor for shutter means 64: Stopper means 66: Stopper Means motor 68: engagement concave portion 69: hole 80: second optical unit 82: rear lens frame 84a to 84d: second group lens 83: upper frame of second optical unit 85: ring-shaped convex portion 87: hole 88: Hook 89: Pin 92: CCD

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/238 H04N 5/238 Z (72) Inventor Naoki Fujii 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industrial Co., Ltd. F-term (reference) 2H054 AA01 BB02 2H100 BB06 BB08 CC07 2H101 DD65 5C022 AA13 AB02 AB12 AB15 AB17 AB22 AC03 AC31 AC32 AC33 AC42 AC51 AC52 AC54 AC56 AC73 AC74 AC77 AC78

Claims (6)

[Claims] A first group lens for taking in a light beam from a subject along a first optical axis; and a first lens for holding the first group lens and for adjusting a focus of the first group lens. Holding means for moving parallel to the optical axis, and optical axis converting means for bending a light beam passing through the first group lens along a second optical axis intersecting the first optical axis. A first block, a positioning unit for fixing the first block at a predetermined position, and a light beam bent along the second optical axis by the optical axis conversion unit to form an image on an image sensor. And a second block attached to a camera housing. 2. A photographing lens device for an electronic camera, comprising: 2. The optical system according to claim 1, wherein the second block comprises: a light amount adjusting unit for mechanically adjusting an opening for the light beam bent along the second optical axis by the optical axis converting unit; and the second group lens. 2. The photographing lens device for an electronic camera according to claim 1, further comprising a lens frame for holding, wherein the light amount adjusting unit and the lens frame are separable from each other. 3. A light amount adjusting means for mechanically adjusting an opening for a light beam bent along the second optical axis by the optical axis converting means between the first block and the second block. Is provided.
3. A photographing lens device for an electronic camera according to claim 1. 4. A first optical unit having a first group lens for taking in a light beam from a subject along a first optical axis; holding means for holding the first optical unit; Optical axis converting means for bending a light beam passing through the group lens along a second optical axis intersecting the first optical axis;
An optical axis conversion unit having: a light amount adjustment unit having a light amount adjustment unit for mechanically adjusting an opening for a light beam bent along the second optical axis by the optical axis conversion unit; A second optical unit having a second group lens for forming an image of the formed light beam on the image sensor, and the optical axis conversion unit and the second optical unit being coupled to each other so as to sandwich the light amount adjustment unit therebetween. A photographing lens device for an electronic camera. 5. The electronic camera according to claim 4, wherein said light amount adjusting unit has a diaphragm means for adjusting a diameter of said opening and a shutter means for blocking said opening. Shooting lens device. 6. The optical axis converting means includes a reflecting means for reflecting a light beam.
The photographing lens device for an electronic camera according to any one of the above.