JPH11327009A - Film unit with lens incorporating stroboscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce stroboscopic light emitted in a useless direction and to increase the light quantity of a stroboscope. SOLUTION: This film unit with a lens incorporating a stroboscope is provided with a discharge tube 1 emitting the stroboscopic light and a reflector 3 reflecting the stroboscopic light toward an object. Besides, the rear surface of the tube 1 is provided with a reflection film 2 reflecting the stroboscopic light toward the object. In this case, it is preferable that the film 2 is formed by the deposition of aluminum or the sticking of a reflection sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge tube which emits strobe light, and a neon tube which lights or flashes when the strobe is charged. It relates to a film unit with a built-in lens.

[0002]

2. Description of the Related Art A discharge tube of a strobe emits a strobe light when a trigger voltage is applied by a shutter release. Since the discharge tube is formed of a glass tube, 360
Light is emitted in all directions of the peripheral wall. However, the necessary strobe light is only strobe light emitted toward the subject, and its range corresponds to the angle of view of the photographing lens. Therefore, in order to prevent the strobe light from being unnecessarily diffused, a reflector is arranged around the discharge tube except for the front thereof, and the strobe light is focused toward the subject as much as possible by reflection by the reflector.

Further, the neon tube of the strobe lights or flashes when the strobe is charged. Since the neon tube is formed of a glass tube, it emits light in all directions of the 360-degree peripheral wall. However, the only necessary light is light that shines toward the window provided on the exterior member, and all other light is wasted.

[0004]

As described above, the strobe light from the discharge tube is focused toward the subject by the reflector, but the strobe light emitted behind the discharge tube is reflected by the reflector before being reflected. Although the light again travels toward the discharge tube, a large amount of strobe light is reflected on the back surface of the discharge tube, and a small amount of strobe light passes through the discharge tube and reaches the subject. Such wasted strobe light is generated, and according to one theory, it is said that this wasted strobe light accounts for about 20% of the whole.

The present invention has been made in view of such a problem, and it is a first object of the present invention to propose a film unit with a built-in strobe lens which reduces such useless strobe light as much as possible and further increases the amount of strobe light. It is assumed that.

Further, as described above, of the light emitted from the neon tube, all the light that does not go to the window provided on the exterior member is wasted light.

The present invention has been made in view of such a problem, and it is a second object of the present invention to propose a film unit with a built-in strobe lens in which such wasted light is reduced as much as possible and the light amount of a neon tube is further increased. It is an issue.

[0008]

The first object of the present invention is to provide a film unit with a built-in strobe lens provided with a discharge tube for emitting strobe light and a reflector for reflecting the strobe light toward a subject. The problem is solved by a film unit with a built-in strobe lens, characterized in that a reflecting film for reflecting strobe light toward a subject is provided on the back surface of the tube.

A second object of the present invention is to provide a film unit with a built-in strobe lens, in which the light of a neon tube which lights or blinks when the strobe is charged can be visually recognized from a window provided on an exterior member. The neon tube is disposed so that the peripheral wall can be visually recognized, and a reflection film that reflects light of the neon tube toward the window is provided on a peripheral wall of the neon tube except for a peripheral wall substantially equal to the width of the window. The feature is solved by a film unit with a built-in strobe lens.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] An embodiment of the invention for solving the first problem will be described with reference to FIGS.

FIG. 1 is a sectional view of a strobe light emitting section, and FIG. 2 is a front view of the strobe light emitting section. In both figures, reference numeral 1 denotes a discharge tube, in which xenon gas is sealed in a glass tube. When a high trigger voltage is applied by a shutter release, ionized xenon atoms in the tube fly out of the cathode. Is excited by colliding with and emits strobe light. Reference numeral 3 denotes a reflector, which is made of a bright aluminum alloy or the like, reflects the strobe light emitted around the discharge tube, and condenses it within the angle of view of the taking lens. Reference numeral 4 denotes a strobe panel formed of a transparent resin and covered from the front to protect the discharge tube 1 and the reflector 3.

A reflection film 2 having an inner surface as a reflection surface is provided on the back surface of the discharge tube 1. The reflection film 2 is formed by vapor deposition of conductive aluminum, or is formed by attaching a conductive reflection sheet. Accordingly, as shown in a partially enlarged view of the discharge tube in FIG. 3A, the strobe light emitted backward inside the discharge tube 1 passes through the rear glass tube 1a, is reflected by the reflection film 2, and is again emitted. The light passes through the rear glass tube 1a. Then, the strobe light passes through the front glass tube 1b and is emitted toward the subject.

On the other hand, a partially enlarged view of a conventional discharge tube is shown in FIG.
As shown in (B), the strobe light emitted backward in the discharge tube 1 passes through the rear glass tube 1a,
And irradiates the discharge tube 1. At this time, a part of the strobe light is reflected by the outer surface 1c of the rear glass tube 1a and does not enter the discharge tube 1, and only the remaining strobe light enters the discharge tube 1 and is similar to the above. Shoot toward the subject.

Thus, by providing the reflection film 2 on the back surface of the discharge tube 1, it is possible to irradiate the object with the strobe light more efficiently than in the past.

The length of the reflective film 2 in the circumferential direction is determined by the thickness of the discharge tube, the angle of view of the taking lens, the shape of the reflector 3, and the like.

When the length of the reflective film 2 in the longitudinal direction is longer than the width of the reflector 3 and is located near the anode or cathode of the discharge tube 1, the reflective film 2 is conductive. For this reason, there is a risk that the trigger voltage is discharged and light emission failure occurs. Therefore, it is desirable to insert an insulating ring 5 as shown in FIG.

[Second Embodiment] An embodiment of the invention for solving the second problem will be described with reference to FIGS.

FIG. 5 is a sectional view of the neon tube. The neon tube 11 has a substantially cylindrical glass tube filled with neon gas. When the main capacitor of the strobe is charged to a voltage capable of emitting light, the internal electrodes are turned on. Also, it flashes depending on the flash circuit. Therefore, in order to confirm the charging of the strobe, it is usually arranged so that the peripheral wall of the substantially cylindrical neon tube 11 is visually recognized, and as shown in FIG.
From the window 13a provided in the camera.

Since the neon tube 11 has no directivity and emits light in all directions, the light seen from the window 13a is a part of the light. Therefore, the reflection film 12 is provided on the peripheral wall of the neon tube 11 except for the peripheral wall which is substantially equal to the width of the window 13a, and reflects light in a downward or lateral direction with respect to the window 13a to guide the light toward the window 13a. This reflection film 12 is formed by aluminum evaporation,
It is formed by sticking a reflection sheet.

Accordingly, light emission in a meaningless direction is not performed, and light in the direction toward the window 13a increases, so that brighter light from the neon tube 11 can be visually recognized. As a result,
Even in a flash shooting in a relatively bright place such as a window, a forest, or a car, the charged state can be visually confirmed.

As shown in the perspective view of FIG. 6, the reflecting plate 21 is formed by rounding a plate material leaving a gap substantially equal to the width of the window 13a and forming a reflecting film 21a on the inner surface by aluminum evaporation or sticking of a reflecting sheet. Is provided, and the gap 21b is formed in the window 1 of the exterior member 13.
Even when the reflector 21 is inserted into the neon tube 11 as shown in the perspective view of FIG. Reference numeral 21c denotes a stopper in the insertion direction of the reflection plate 21.

[0022]

According to the film unit with a built-in strobe lens according to the first to third aspects, useless strobe light is reduced by the reflection film provided on the discharge tube, and the amount of strobe light is increased.

According to the film unit with a built-in strobe lens according to the fourth to sixth aspects, useless light is reduced by the reflection film provided on the neon tube, and the light amount of the neon tube is increased.

[Brief description of the drawings]

FIG. 1 is a sectional view of a strobe light emitting unit.

FIG. 2 is a front view of a strobe light emitting unit.

FIG. 3 is a partially enlarged view of the discharge tube of the embodiment and a conventional discharge tube.

FIG. 4 is a front view of the discharge tube in which an insulating ring is inserted.

FIG. 5 is a sectional view of a neon tube.

FIG. 6 is a perspective view of a reflection plate and a neon tube.

FIG. 7 is a perspective view in which a reflecting plate is inserted into a neon tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Discharge tube 2, 12, 21a Reflective film 3 Reflector 5 Ring 11 Neon tube 13 Exterior member 13a Window 21 Reflector

Claims (6)

[Claims] 1. A film unit with a built-in strobe lens having a discharge tube for emitting strobe light and a reflector for reflecting the strobe light toward a subject, wherein the strobe light is directed toward the subject on the back of the discharge tube. A film unit with a built-in strobe lens, which is provided with a reflective film for reflection. 2. The film unit with a built-in flash according to claim 1, wherein the reflection film is formed by vapor deposition of aluminum or sticking of a reflection sheet. 3. A strobe built-in lens according to claim 1, wherein a ring having an insulating property is inserted between the positive electrode and the reflective film and between the negative electrode and the reflective film of the discharge tube. Film unit. 4. A film unit with a built-in lens for a strobe, wherein light from a neon tube that turns on or blinks when the strobe is charged is viewed from a window provided on an exterior member, wherein the surrounding wall of the neon tube is visible from the window. Wherein the neon tube is disposed, and a reflection film for reflecting light of the neon tube toward the window is provided on a peripheral wall of the neon tube except for a peripheral wall substantially equal to the width of the window. Film unit with lens. 5. The film unit with a built-in strobe lens according to claim 4, wherein the reflection film is formed by aluminum deposition or sticking of a reflection sheet. 6. A reflector in which a plate material is rounded leaving a gap substantially equal to the width of the window, and a reflection surface is formed on the inner surface by aluminum evaporation or affixing a reflection sheet, wherein the gap is in the direction of the window of the exterior member. The film unit with a built-in strobe lens according to claim 4, wherein the film unit is inserted into the neon tube so as to be positioned.