JPH0443386A - Hologram photographing method - Google Patents

Abstract

PURPOSE:To evade photographing a supporting tool for supporting an object by making the surface of the supporting tool smooth and setting it so that a reflected light beam which is reflected at a fixed reflection angle from the smooth surface except the edge of the supporting tool may not be made incident on a hologram dry plate. CONSTITUTION:The shape is decided so that the edge 23 of a glass substrate 2 may be out of an optical path of the irradiating light beam 5. Therefore, an irradiating light beam 5 is not irregularly reflected by the edge 23 of the substrate 2. Then, the angles of the substrate 2 and the irradiating light beam 5 are set so that the hologram dry plate 3 may not be arranged in the optical paths of the irradiating light beam 5, the surface reflected light beam 6 and the back surface reflected light beam 11. Therefore, the reflected light beams 6 and 11 reflected by the glass substrate 2 are not made incident on the object 1, so that only the object 1 is photographed on the hologram dry plate 3. Thus, the supporting member is prevented from being photographed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a hologram photographing method.

[Prior Art] When photographing a subject on a hologram dry plate, the exposure time is generally long, so the back or bottom surface of the subject 300 is firmly fixed to supports 301 and 302, as shown in FIGS. 6 and 7, for example. This prevents blurring. However, in the case of FIG. 7, there is a drawback that the support 302 is imaged in VR, and in the case of FIG. 6, there is a drawback that the support plate 303 for supporting the support 301 is photographed.

Japanese Unexamined Patent Publication No. 60-83982 discloses the above-mentioned back support method (
6), the subject 30 is placed in front of the support plate 303.
This disclosure discloses a hologram photographing method in which a mask plate that vibrates independently of the support plate 303 and the support plate 303 is provided to shield the support plate 303.

[Problem to be solved by the invention] However, in the hologram photographing method of the above-mentioned publication,
A mechanical vibration system including a mask plate excitation means must be provided close to the subject 303 that is to be kept stationary, which complicates the configuration.

The present invention has been made in view of the above-mentioned problems, and an object to be solved is to provide a hologram photographing method that can prevent support device photographing and has a simple configuration.

[Means for Solving the Problems] A hologram photographing method of the present invention includes mounting a subject on the smooth plane of a support having a smooth plane, and attaching a predetermined surface to the smooth plane excluding the edge of the support and the subject. Irradiation light of a predetermined wavelength is incident at an incident angle, at least a part of the irradiation light is reflected as reflected light at a predetermined reflection angle, and the space in front of the subject excluding the optical path of the irradiation light and the reflected light is It is characterized in that a hologram dry plate is disposed facing the subject, and the hologram dry plate is irradiated with reference light that can interfere with the irradiation light.

[Example] (Example 1) An example apparatus for carrying out the hologram photographing method of the present invention will be described with reference to FIG.

This hologram imaging device uses a glass substrate with a certain thickness (
Supports 2 (as referred to in the present invention) are arranged vertically in the figure, and a radiation subject 1 is adhered to the center of the surface 21 (smooth plane as referred to in the present invention) of the glass substrate 2. A hologram dry plate 3 is arranged on the right side of the target object 1 in the figure at a predetermined distance from the target object 1, and the smooth surface 21 and back surface 22 of the glass substrate 2 are the same as the smooth surface of the hologram dry plate 3. 31 and the back surface 32.

Here, irradiation light 5 is projected obliquely onto the front surface 21 of the glass substrate 2 and the subject 1 from a laser light source (not shown) provided above the hologram dry plate 3, and at the same time, the back surface 32 of the hologram dry plate 3 is projected from this laser light source. A reference beam 4 is projected obliquely onto the image.

In this way, a portion of the irradiation light 5 is reflected from each part of the subject 1 to become object light 8, and the object light 8 interferes with the reference light 4 to expose the hologram dry plate 3. At the same time, a portion of the irradiated light 5 is reflected by the front surface 21 and back surface 22 of the glass substrate 2, respectively, to become front surface reflected light 6 and back surface reflected light 11 (see FIG. 2 for details of reflection).

Note that the reference light 4 is separated from the irradiation light 5 by a prism or a half mirror (not shown) placed in the optical path of the irradiation light 5, and is made parallel to the irradiation light 5 by a mirror (not shown).

One important point is that the shape of the edge 23 of the glass substrate 2 is determined to be outside the optical path of the irradiated light 5,
Therefore, the irradiated light 5 is not diffusely reflected by the edge 23 of the glass substrate 2.

The second important point is that the angles of the glass substrate 2 and the irradiated light 5 are set so that the hologram dry plate 3 is not placed in the optical path of the irradiated light 5, the front surface reflected light 6, and the back surface reflected light 11. In this way, each of the reflected lights 6 and 11 reflected by the glass substrate 2 will not be incident on the subject 1, and only the subject 1 will be reflected on the hologram dry plate 3.

Although the glass substrate 2 is used as the support in this embodiment, it is sufficient to form a smooth plane on the surface of the support that reflects part or all of the incident light in a certain direction.
(Mirror 4 in Figure 3)
0 is provided on the back surface), and the glass substrate 2
A resin plate or a metal plate may be used instead. This form of forming a mirror is more advantageous because unnecessary background on the back of the glass substrate 2 can be shielded.

In addition, the absorption band of the glass cover plate 2 and the resin plate is set to the laser wavelength range to reduce the back reflected light 11, and the glass cover plate 2
Forming a light absorption layer having an absorption band in the laser wavelength range on the back surface of the resin plate has the advantage of reducing reflected light ants.

(Embodiment 2) Another embodiment of the apparatus for carrying out the hologram photographing method of the present invention will be described with reference to FIGS. 4 and 5.

This hologram photographing device has basically the same structure and function as the device of the first embodiment, but is unique in that antireflection 10100.100 is coated on the front surface 21 and back surface 22 of the glass substrate 2. be.

The antireflection film 100 is a thin flat plate having a predetermined refractive index n and is transparent to this laser beam, and FIG. 5 shows an enlarged view of its surface.

The film thickness of the antireflection film 100 is d, and the surface 21 of the glass substrate 2
The reflection angle at e-1 is λ/4, where the wavelength of light is λ.
−n −d/ (S i nθ−).

In this way, the surface 101 of this antireflection film 100
Since the phase of the front surface reflected light 6a from the front surface and the back surface reflected light 11a from the back surface 102 (the front surface 21 of the glass substrate 2) are shifted by half a wavelength, the amount of reflected light can be reduced. Furthermore, by appropriately selecting the refractive index and the incident angle θ of the glass substrate 2 and the antireflection film 100, the intensity of the surface reflected light 6a and the back surface reflected light 11a can be designed to be equal, thereby making it possible to significantly reduce the reflected light. .

The advantages of this embodiment will be explained below.

As shown in FIG. 4, due to the shape of the subject 1a, the reflected light 11a from the front surface 21 or the back surface 22 of the glass substrate 2 is re-reflected on the surface of the subject 1a, and a hologram dry plate (not shown) is generated.
However, according to this embodiment, since the amount of reflected light itself is reduced, the adverse effects of this re-reflection are reduced.

(Embodiment 3) FIG. 6 shows another embodiment of the apparatus for carrying out the hologram photographing method of the present invention.

This hologram photographing device is a device that can perform distance and near double photography of subjects 1a and 1b in the left-right direction in the figure, that is, with respect to a hologram dry plate 3 on the right side in the figure, and is arranged parallel to a glass substrate 2a and a glass substrate 2a at a constant distance from each other. installed glass substrate 2a
, 2b, the objects 1a and 1b are individually adhered to the right surfaces of each of them. As in this example, the glass substrate is
It is possible to use a multi-plate format as in this embodiment instead of a single-plate format as shown in FIG. 1, and a unique photographic effect can be realized.

Note that each of the glass substrates 2a and 2b can be arranged at any angle within a range where the reflected light 6.11 does not enter the hologram substrate 3.

(Further Modifications) Alternatively, the subject 1 may be adhered to the front and back sides of the glass substrate 1, respectively.

[Effects of the Invention] As explained above, the hologram photographing method of the present invention makes the surface of the support that supports the subject a smooth plane, and the reflection that is reflected at a constant reflection angle from the smooth plane excluding the edge of the support. Since the setting is made so that the light does not enter the hologram dry plate, it is possible to avoid photographing the support.

In particular, since the projected light is prevented from entering the edge of the support, diffused reflection at the edge can be prevented.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of an apparatus for carrying out the hologram photographing method of the present invention, FIG. 2 is an explanatory diagram illustrating the optical path of reflected light, and FIG. 3 is a modification of the first embodiment of the apparatus. 4 is a side view illustrating the device of the second embodiment, FIG. 5 is an enlarged side view of the surface portion of the device in FIG. 4, and FIG.
FIGS. 7 and 8 are side views illustrating a conventional hologram photographing apparatus. Patent applicant Nippondenso Co., Ltd. Agent Patent attorney Hiroshi Okawa Figure 1 Figure 6 Za /○

Claims (1)

[Scope of Claims] A subject is mounted on the smooth plane of a support having a smooth plane, and irradiation light of a predetermined wavelength is incident on the smooth plane excluding the edge of the support and the subject at a predetermined incident angle. , reflecting at least a part of the irradiated light as reflected light at a predetermined reflection angle, and disposing a hologram dry plate facing the subject in a space in front of the subject excluding the optical path of the irradiated light and the reflected light. A hologram photographing method, characterized in that the hologram dry plate is irradiated with a reference light that can interfere with the irradiation light.