JP3402749B2 - Optical system for imprinting information - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system for recording character information such as date on a film in a camera having a plurality of photographing modes having different screen sizes.

[0002]

2. Description of the Related Art There are some photographic cameras capable of recording the date, time, and the like at the time of shooting in the corner of the screen.

As a method for recording such a date, a method of recording from the back side of the film has been conventionally used. In this method, since the imprinting mechanism is housed in the camera, the back cover becomes thick and the camera cannot be downsized.

Therefore, recently, a method of recording from the front side of the film has been proposed and commercialized. In this case, the range of the luminous flux reaching from the photographing lens is excluded, and the space in front of the film is effectively used, and a character information display member and an imaging lens are arranged to record on the film.
In this way, since the imprinting mechanism is housed inside the camera, the camera can be downsized without the back cover becoming thick unlike the conventional one.

On the other hand, like a panoramic camera,
The number of people who enjoy pictures by changing the screen size is increasing.
In addition, it is possible to obtain a powerful photograph by enlarging it more than ever before. However, the conventional camera is unsightly when the screen size is changed, the character information is missing, or the character information becomes large even if imprinted.

In Japanese Laid-Open Patent Publication No. 62-103625, a back cover imprinting device is provided with light emitting portions of two different character sizes, and these are switched. This basically requires the same number of light emitting units as the types of screen sizes that can be photographed, and it is necessary to change the size and position of each character.

Japanese Unexamined Patent Publication No. 63-27823 discloses a method of photographing from the camera body side. In this conventional example, a light emitting member is imaged on a film by an imaging lens, and the magnification is changed by changing the imaging lens to change the size of the character, but the recorded position is changed. do not do.

Further, in Japanese Unexamined Patent Publication No. 6-35061, one fixed light emitting member and two fixed lenses are arranged, and by switching the light shielding member, the magnification and position of the imprinting can be determined. The means to be changed are described.

[0009]

Among the above-mentioned conventional examples,
The method disclosed in Japanese Patent Laid-Open No. 62-103625 is a method of imprinting from the back cover side, which is not preferable for downsizing the camera.

In Japanese Patent Laid-Open No. 63-27823, the image is imprinted from the camera body side, and the character information can be imprinted by changing the magnification, but the imprinting position cannot be changed.

Further, Japanese Unexamined Patent Publication No. 6-35061 discloses an imprinting means capable of changing magnification and position, but does not specifically describe an optical system. An object of the present invention is to use a camera having a plurality of shooting modes with different screen sizes, and change the imprinting position and size in association with the change of the shooting mode in order to record character information such as date from the camera body side. It is to provide an optical system that can be taken as a copy.

[0012]

An optical system for imprinting information according to the present invention comprises an optical system for recording character information or the like on an image receiving means such as a film in a camera having a plurality of photographing modes having different screen sizes. This optical system has a display member and an image forming lens for forming an image on the image receiving surface of the image receiving means, and the image forming lens has at least one aspherical surface. It is characterized in that a position for recording character information and the like (a position on the image receiving surface of the image receiving means) and a magnification are changed by switching the image forming lens to be used.

Further, the present invention is a photographing apparatus having an optical system for imprinting information having the above construction. That is, it comprises a taking lens, an image receiving means for receiving an image formed by the taking lens, and an optical system arranged on the side where the taking light enters the image receiving means for projecting information different from the image on the image receiving means. The optical system has an information display member and a plurality of imaging lens systems each forming an optical path for projecting light from the information display member onto the image receiving means, and each of the imaging lens systems is at least It has one aspherical surface, and each optical path is provided with means for selectively allowing the light from the display member to enter, and by switching a plurality of optical paths, the information displayed on the display member has different magnifications. It is characterized in that the image is projected onto a different position of the image receiving means.

The present invention is used, for example, in a camera having a plurality of photographing modes having different screen sizes, and relates to an optical system for imprinting character information and the like on the film from the camera body side, which constitutes the optical system. And a plurality of image forming lens systems each having at least one aspherical surface, and by selectively using the image forming lenses in conjunction with switching of photographing modes, The image formation of the character information of the display member and the magnification change are performed at different positions.

For example, in FIG. 3, (A) shows the case where the dimensions of the long sides and the short sides are changed, and (B) shows the case where the dimensions of only the short sides are changed. That is, (B) corresponds to a panoramic photograph. In FIGS. 3A and 3B, the solid line 1 indicates the screen size in the first mode, and the character information 3 is recorded in the corner of the screen. What is indicated by a broken line 2 is the screen size of the second mode, and the character information 4 is imprinted at the position shown in the figure. The character information 4 in the second mode is reduced and imprinted as compared with the character information 3. That is, with the above-described information imprinting optical system of the present invention, the position and magnification on the film surface can be changed as shown in FIG. In this way, when the photographs in both modes are printed in the same size, the character information on the prints is in the same state. Of course, it is not necessary to make the sizes the same on the print, and the sizes may be arbitrary within a range that does not cause unnaturalness, and the imprinting position on the film can be changed.

[0016]

EXAMPLES Next, examples of the present invention will be described.

FIG. 1 is a conceptual diagram of Embodiment 1 of the present invention, FIG.
Is a development view (a diagram in which the optical axis is linearly extended). In the figure, 11 is a display member for displaying character information and the like, 12a, 12
b is an aperture stop, 13a and 13b are image forming lenses, 14 is a film surface, 15a and 15b are axes of an optical path from the display member 11 to the film surface, and 16a and 16b are reflective surfaces. The aperture stop 12a, the imaging lens 13a, the film surface 14, the optical axis 15a, and the reflection surface 16a are the first mode or the display member 11b, the aperture stop 12b, the imaging lens 13b, the film surface 14, the optical axis 15b, and the reflection surface. 1
6b relates to the second mode. In this embodiment, the imaging lens for both the first mode and the second mode is an integrally formed prism-shaped lens having reflecting surfaces 16a and 16b, and its entrance surface and exit surface are curved surfaces to form an image. Have an effect. The imaging lens 13a is the imaging lens 1
3b, and the entrance surfaces of the diaphragm 12a and the imaging lens 13a are slightly shorter than the diaphragm 3b.
It is arranged at a position slightly closer to the display member 11 than the incident surface of 3b. The optical axes of the two imaging lenses 13a and 13b are substantially parallel. Here, the imaging lens 13
The optical axes before reaching the reflecting surfaces 16a and 16b of a and 13b are
The reflecting surface 1 is arranged substantially parallel to the film surface 14.
6a and 16b are inclined at about 45 °, and the first mode,
Information is projected on the film surface 14 from almost the front surface in any of the optical paths in the second mode.
The two imaging lenses 13a and 13b are arranged so as to be in contact with each other on their side surfaces, but they may be integrally molded. Light emitted from the display member 11 for both modes enters the imaging lens 13a or 13b through the aperture stop 12a or 12b, is reflected by the reflecting surface 16a or 16b, and then exits from the imaging lens 13a or 13b. Then, an image is formed on the film surface 14.

In the first embodiment, since the exit surface of the imaging lens 13b is located below the exit surface of the imaging lens 13a, information is recorded inside the film surface 14 in the second mode. . In this embodiment, by changing the angles of the reflecting surfaces 16a and 16b, the angle of the optical path incident on the film surface 14 from the imaging lenses 13a and 13b changes. Therefore, by adjusting the angles of the reflection surfaces 16a and 16b, information such as characters can be imprinted from an appropriate position that does not interfere with the photographing light flux. However, the film surface 14
When the angle of the incident light beam with respect to is large, the character is distorted or a part of the character is out of the depth of focus and blurs. Therefore, it is necessary to set an appropriate angle so that such a problem does not occur.

Further, in this embodiment, one display member is arranged at a position corresponding to approximately the center of the openings of the two aperture diaphragms 12a and 12b. Therefore, the optical paths 15a and 15b
Is inclined with respect to the optical axes of the imaging lenses 13a and 13b, and the whole is a decentered optical system. Specifically, the optical axis of the imaging lens 13a and the optical axis of the imaging lens 13b are separated by 3 mm, and the display member 11 is arranged at the center thereof.
In the case of such a configuration, if the distance from the display member 11 to the incident surface of each of the imaging lenses 13a and 13b is significantly different,
The light flux from the display member 11 may be eclipsed by one of the imaging lenses. In FIG. 1, there is a possibility that the light flux that enters the imaging lens 13b will be eclipsed by the imaging lens 13a. A simple method for preventing this eclipse is to further separate the two imaging lenses 13a and 13b from each other, but the optical system becomes large and aberration correction becomes difficult, or the central axis of the optical system becomes difficult. There is a problem that the distortion of characters is increased because 15a and 15b intersect the film surface at an angle. In order to solve this problem, in the present invention, the positions of the entrance surfaces of the respective imaging lenses 13a and 13b are arranged as close as possible, and the deviation of the entrance surfaces is set to about 5 mm or less.

In the first embodiment, as shown in FIG. 2, both image forming lenses are constituted by a biconvex single lens, and the exit surface thereof is an aspherical surface. This aspherical surface is for correcting spherical aberration and coma.

In the first embodiment, in the first mode,
The length (IO) from the display member to the film surface is 30 mm,
Imaging magnification is -1.0, effective F number is 8.0, and second
In the mode, the length from the display member to the film surface is 35 mm, the imaging magnification is -0.7, and the aperture diaphragm is the same, so the effective F number is 6.5. Therefore, the amount of light increases, so you can change the exposure time or ND
Appropriate dimming means such as adding a filter or mixing dye in the imaging lens 13b to reduce the transmittance may be used.

The data of the optical system of Example 1 are as follows. Example 1 The first mode magnification = -1.0, IO = 30mm, effective F-number = 8.0 r ₁ = display unit d ₁ = 10.85 r ₂ = aperture _{d 2 = 0.20 r 3 = 5.466} d 3 = 7.85 n 1 = 1.48993 ν ₁ = 57.66 r ₄ = -5.387 d ₄ = 11.10 r ₅ = film surface aspherical coefficient (4 surfaces) P = 0.5549, A ₄ = 1.6133 × 10 ⁻³ , A ₆ = −1.8499 × 10 ⁻⁴ A ₈ = 4.0395 × 10 ^-5 Second mode magnification = -0.7, IO = 35 mm, effective F number = 6.5 r ₁ = display section d ₁ = 13.63 r ₂ = diaphragm d ₂ = 0.20 r ₃ = 9.679 d ₃ = 10.07 n ₁ = 1.48993 _{ν 1 = 57.66 r 4 = -4.495} d 4 = 11.10 r 5 = film surface aspheric coefficients (fourth _{surface) P = 0.1892, A 4 =} 3.7695 × 10 -4, A 6 = -3.7892 × 10 -5 A 8 = 9.9434 × 10 ^{−6 In} this embodiment, the imaging lens 13a and the imaging lens 1
3b may be arranged separately, may be adhered, or may be integrally formed as one component. In selecting the mode, the aperture stop 12 may be provided with a shutter mechanism, or a separate shutter mechanism may be provided, for example, near the exit surface of the imaging lens. In the first embodiment, since the distance from the exit surface to the film surface is the same in the first mode and the second mode, it is easy to provide the shutter mechanism. In addition, the positions of the first mode and the second mode may be left and right interchanged. or,
The reflecting surface 16 is preferably a total reflecting surface in terms of cost.

The display member used in the present invention can be an LED or an illuminated LCD. Further, all the optical components are made of a plastic material.

FIG. 4 is a perspective view showing the concept of the second embodiment, and FIG. 5 is a lens development view. In this figure, 11 is a display member, 12a and 12b are aperture diaphragms, 13a and 13b are imaging lenses, 14 is a film, 15a and 15b are optical axes,
Reference numerals 16a and 16b are reflection surfaces.

In the second embodiment, the imaging lenses 13a and 13a
Since the optical axis of b and the central axis of the optical system coincide with each other, there is no eccentricity. The two imaging lenses 13a and 13b are arranged along the thickness direction of the camera body. That is, the imaging lens 13a and the imaging lens 13b are arranged so as to overlap each other in the vertical direction. In the second embodiment, the imaging lens 13a,
Reference numeral 13b denotes an integrally formed lens having reflecting surfaces 16a and 16b, which has a portion rising above the reflecting surface and a portion extending from the reflecting surface toward the film surface. In each of the rising portion and the extending portion of the imaging lens, the imaging lens 13a is shorter than the imaging lens 13b. The distance from the film to the exit surface of the imaging lens toward an imaging lens 13 b is shortened. The optical axes of the two imaging lenses are substantially parallel to each other, as in the first embodiment. In the second embodiment, mode switching is performed by moving the display member 11. Therefore, the character information or the like moves along the short side direction of the film due to the movement of the display member 11. At this time, a method may be used in which two display members are prepared and the display members are selectively caused to emit light in synchronization with mode switching.

The data of the optical system of Example 2 are as follows. Example 2 first mode magnification = -1.0, IO = 30mm, effective F-number = 8.0 r ₁ = display unit d ₁ = 9.15 r ₂ = aperture _{d 2 = 0.20 r 3 = 6.031} d 3 = 9.73 n 1 = 1.48993 ν _{1 = 57.66 r 4 = -4.313 d} 4 = 10.92 r 5 = film surface aspheric coefficients (fourth _{surface) P = 0.4979, A 4 =} 1.4033 × 10 -3, A 6 = -4.5822 × 10 -4 A 8 = 1.9361 × 10 ^-4 2nd mode magnification = -0.7, IO = 35 mm, effective F number = 5.7 r ₁ = display part d ₁ = 13.90 r ₂ = diaphragm d ₂ = 0.20 r ₃ = 5.245 d ₃ = 12.96 n ₁ = 1.48993 ν ₁ = 57.66 r ₄ = -4.999 d ₄ = 7.94 r ₅ = film surface aspherical coefficient (4 surfaces) P = -0.1002, A ₄ = 1.5806 × 10 ^-3 , A ₆ = -7.7505 × 10 ^-4 A ₈ = 4.2236 × 10 ^-4 In the second mode, as in the first mode, the length from the display member to the film surface is 30 mm and the imaging magnification is − in the first mode.
1.0 and the effective F number is 8.0. In the second mode, the length from the display member to the film surface is 35 mm, the imaging magnification is -0.7, and the aperture diaphragms 12a and 12b are the same size, so the effective F number is 5.7. .

FIG. 6 is a perspective view showing the concept of the fourth embodiment.
7 is a development view of the lens. In FIG. 6 , 11 is a display member, 12a and 12b are aperture diaphragms, and 13a and 13b.
Is an imaging lens, 14 is a film, 15a and 15b are optical axes, and 16a and 16b are reflecting surfaces. Example 3 is the first
The exit surface of the mode imaging lens 13a is formed on the lens side surface, and the exit surface of the second mode imaging lens 13b is provided at a position protruding from the side surface, and the exit surface of the imaging lens from the film surface 14 is provided. The distance to is closer in the second mode. The aperture stop is provided on the exit side of the exit surface of the imaging lens, and the second mode aperture is smaller than the first mode aperture. The data of the optical system of Example 3 are as follows. Example 3 first mode magnification = -1.0, IO = 30mm, effective F-number = 8.0 r ₁ = display unit _{d 1 = 8.04 r 2 = 5.599} d 2 = 11.61 n 1 = 1.48993 ν 1 = 57.66 r 3 = -3.911 d ₃ = 0.20 r ₄ = Aperture d ₄ = 10.15 r ₅ = Aspherical coefficient of film surface (2 surfaces) P = 0.0411, A ₄ = -2.7233 × 10 ^-4 , A ₆ = -5.0896 × 10 ^-5 , A ₈ = 0 Aspherical surface coefficient (3 surfaces) P = 10.9741, A ₄ = 4.0725 × 10 ^-2 , A ₆ = -7.3907 × 10 ^-3 , A ₈ = 0 Second mode magnification = -0.7, IO = 35 mm, effective F Number = 8.0 r ₁ = Display part d ₁ = 8.04 r ₂ = 5.599 d ₂ = 18.72 n ₁ = 1.48993 ν ₁ = 57.66 r ₃ = -3.343 d ₃ = 0.20 r ₄ = Aperture d ₄ = 8.04 r ₅ = Film surface Aspherical coefficient (2 surfaces) P = 0.0411, A ₄ = -2.7233 × 10 ^-4 , A ₆ = -5.0896 × 10 ^-5 , A ₈ = 0 Aspherical coefficient (3 surfaces) P = 3.9617, A ₄ = 3.2994 the first mode is _{^{× 10 -2, a 6 = -2.7123}} × 10 -2, a 8 = 0 example 3, Length from Example 1 in the same manner as in the display member to the film surface is 30 mm, the imaging magnification -
The effective F number is 1.0 and is 8.0. In the second mode, the length from the display member to the film surface is 35 mm, the imaging magnification is -0.7, and the effective F number is 8.0. or,
As shown in FIG. 7 , both of the imaging lenses are biconvex single lenses, and both surfaces are aspherical surfaces, but as shown in FIG. 6 , the entrance surfaces of the two imaging lenses are formed as a single surface. Therefore, the optical axes 15a and 15b of both imaging lenses are an optical system decentered with respect to this incident surface.

In each of the above-mentioned embodiments, the magnification is lowered by changing the first mode to the second mode, but the magnification may be increased conversely.

The shape of the aspherical surface used in the above embodiments is represented by the following equation when the z-axis is taken in the traveling direction of light on the optical axis and the y-axis is taken in the direction orthogonal to the optical axis.

Where r is the paraxial radius of curvature, p, A ₄ , A
₆ and A ₈ are aspherical coefficients.

In the data of each embodiment, r ₁ , r ₂ , ...
· The radius of curvature of each surface, d _1, d _2, · · · is the distance between the surfaces, the value for the wavelength 655nm in refractive index of n lens,
ν is the Abbe's number for the d-line, and all examples are acrylic. Since this acrylic is easily affected by changes in temperature and humidity, a low hygroscopic material may be used to prevent the effect of humidity.

In the developed view of each embodiment, the respective modes are discriminated from each other and the upper part is the first mode and the lower part is the second mode. Therefore, for example, although the display section is shown separately, the display section 11 is the same in both the first and second modes as shown in the perspective view in the first, third, fourth, and fifth embodiments. That is, the actual configuration is different from the development view and is as shown in the perspective view.

A development view of each embodiment (FIGS. 2, 5, and 5)
In 7) , the first mode is described separately in (A) and the second mode is described in (B), but the film surface is the same surface, and in Examples 1 and 3, the display unit is common and the actual configuration is the same. it is shown in Figure 1 and 6.

The present invention includes not only what is described in each claim of the above claims, but also what is described in each of the following items.

(1) An optical system for imprinting information according to claim 1 or 2, wherein the optical system has a reflecting surface.

(2) An optical system according to claim 1, wherein the image forming lens is a single lens.

(3) An optical system according to claim 1 of the claims, wherein the image forming lens has a reflecting surface and is for imprinting information.

(4) The optical system described in the item (3), wherein the image forming lens is formed as a prism.

(5) An optical system according to claim 1 of the claims, wherein the surface on the exit side is an aspherical surface, and which is for imprinting information.

(6) The optical system according to claim 1 of the present invention, which is an optical system for imprinting information, wherein a plurality of imaging lenses are integrally formed.

(7) An optical system for information imprinting according to claim 1, wherein a plurality of imaging lenses are arranged such that their incident surfaces are close to each other.

(8) The optical system according to claim 1 of the invention, wherein the plurality of imaging lenses have a common entrance surface for information transfer.

(9) An optical system for imprinting information according to claim 1, wherein the plurality of imaging lenses have the same incident surface.

[0044]

According to the optical system for imprinting information of the present invention, it is possible to reliably record character information in a natural size and at a natural position even if the screen size changes.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a development view of the first embodiment.

FIG. 3 is a diagram showing a state of imprinting character information and the like on a film surface.

FIG. 4 is a perspective view of a second embodiment of the present invention.

FIG. 5 is a development view of the second embodiment.

FIG. 6 is a perspective view of a third embodiment of the present invention.

FIG. 7 is a development view of the third embodiment.

Claims (9)

(57) [Claims] 1. A camera having a plurality of photographing modes with different screen sizes, comprising an optical system for recording character information and the like on an image receiving means such as a film, the optical system having a display member and a plurality of imaging lenses. And each of the plurality of imaging lenses
Includes one reflecting surface, and the entrance surface and the exit surface are convex surfaces, respectively.
Each prism
Of the incident surface of is close to 5 mm or less, and
The length of the imaging lens is smaller than that of other imaging lenses with a small imaging magnification.
Shorter than length, each said prism has at least one aspherical surface, for use with switching of shooting modes
An optical system for imprinting information, characterized in that a position for recording character information and the like and a magnification are changed by switching prisms . 2. A taking lens, an image receiving means for receiving an image formed by the taking lens, and an image receiving means for projecting information different from the image onto the image receiving means. is provided with an optical system having said optical system is information display member, and a plurality of the imaging lens system for an optical path formed respectively for projecting light to the image receiving means from said display member, said plurality Each of the image forming lenses has one reflecting surface
A prism whose entrance and exit surfaces are convex
And the deviation of the incident surface of each prism.
Close to 5 mm or less, and the length of one imaging lens
Is shorter than the length of other imaging lenses with small imaging magnification,
Each of the prisms has at least one aspherical surface, is provided with means for selectively allowing light from the display member to enter each of the optical paths, and the information displayed on the display member can be displayed by switching the plurality of optical paths. An image pickup apparatus, characterized in that it is projected at different positions of the image receiving means at different magnifications. 3. An information copy according to claim 1, further comprising a shutter provided on an entrance side or an exit side of the prism , wherein light is selectively made incident on the plurality of imaging lenses by opening and closing the shutter. Embedded optics. 4. The information imprinting optical system according to claim 1, wherein light is selectively made incident on the plurality of prisms by moving the display member. 5. A display member is provided so as to correspond to each of the imaging lenses, and light is selectively made incident on the plurality of prisms by selectively causing each display member to emit light. Optical system for imprinting information. 6. The information imprinting optical system according to claim 1, wherein the exit side surface of the prism is an aspherical surface. 7. The information imprinting optical system according to claim 1, wherein the plurality of prisms are integrally formed. 8. The information imprinting optical system according to claim 1, wherein all of the plurality of prisms have a common incident surface. 9. An aperture stop is provided on the exit side of the exit surface of both prisms.
The aperture at low magnification is smaller than that at high magnification.
The information imprinting according to claim 1 or 2, wherein
Optical system for personal use.