Photography – With object illumination for exposure – Reflector detail
Reexamination Certificate
2001-05-02
2003-09-30
Adams, Russell (Department: 2851)
Photography
With object illumination for exposure
Reflector detail
C362S016000
Reexamination Certificate
active
06628900
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a light emission device, and in particular, to a light emission device that is efficient and is used for a camera and a camera equipped with the light emission device.
In the case where luminance of an object is low when the object is photographed by a camera, it is conducted that a light emission device is interlocked with shutter releasing to emit light and an appropriate exposure is obtained by reflected light from the object. The light emission device of this type can emit flash light when high voltage is impressed on a light emission tube such as a xenon tube. To utilize effectively light emitted from the light emission tube, there is provided, around the light emission tube, a reflection shade that is left open in one direction.
Incidentally, light emitted from the light emission device is attenuated in accordance with its distance, and it is necessary to emit light of higher intensity in terms of quantity of light for an object located at a greater distance. However, when a light emission device is equipped on a camera, its size and cost are restricted, and it is not always possible to prepare a highly efficient light emission device. Though high voltage is needed for making a xenon tube to emit light, even when a light emission tube is changed to one having a large capacity, there is feared a problem that charging takes a long time, because a capacity of a battery is restricted.
Though a light emission tube is usually arranged in the vicinity of a reflection shade, how to support the light emission tube stably without sacrificing easy assembling while keeping low cost is a problem.
SUMMARY OF HE INVENTION
The invention has been achieved in view of the problems stated above, and its object is to provide a light emission device wherein an amount of light emission can be increased only by changing a shape of a reflection shade in a conventional light emission device and a light emission tube can be supported firmly and to provide a camera equipped with the light emission device.
The objects mentioned above are attained by any one of the following structures of light emission devices.
Structure 1: A light emission device having therein a light emission tube which is almost straight in shape and emits light in a radial manner and a reflection shade that reflects light emitted from the light emission tube toward an object, wherein the reflection shade has a reflection surface wherein light emitted from the light emission tube in the direction opposite to the direction from the center of the light emission tube to an object and is reflected on the reflection shade does not interfere with the light emission tube.
Structure 2: A light emission device having therein a light emission tube which is almost straight in shape and emits light in a radial manner and a reflection shade that reflects light emitted from the light emission tube toward an object, wherein the reflection shade has a reflection surface by which a part of reflected light which is to interfere with the light emission tube when the reflected light is reflected on a flat reflection plate that is in contact with the light emission tube is reflected toward the object without interfering with the light emission tube.
Structure 3: A light emission device having therein a light emission tube which is almost straight in shape and emits light in a radial manner and a reflection shade that reflects light emitted from the light emission tube toward an object, wherein the reflection shade has a reflection surface which is behind the position of the reflection shade corresponding to at least the rearmost portion of the light emission tube.
Structure 4: A light emission device having therein a light emission tube which is almost straight in shape and emits light in a radial manner and a reflection shade that reflects light emitted from the light emission tube toward an object, wherein the reflection shade has thereon a ridge which is protruded toward the light emission tube and is extended to be in parallel with the longitudinal direction of the light emission tube.
Structure 5: A light emission device having therein a light emission tube which is almost straight in shape and emits light in a radial manner and a reflection shade that reflects light emitted from the light emission tube toward an object, wherein the reflection shade has thereon a surface that is circumscribed with the rearmost portion of the light emission tube on the inner surface of the reflection shade.
Structure 6: A light emission device having therein a light emission tube which is almost straight in shape and emits light in a radial manner and a reflection shade that reflects light emitted from the light emission tube toward an object, wherein the reflection shade has thereon a groove that is extended to be in parallel with the longitudinal direction of the light emission tube on the side opposite to an object.
Structure 7: A light emission device having therein a light emission tube which is almost straight in shape and emits light in a radial manner and a reflection shade that reflects light emitted from the light emission tube toward an object, wherein the reflection shade has thereon at least two surfaces extended in the direction toward an object and at least two surfaces extended in the direction different from that toward an object, both facing each other with the light emission tube between them.
Structure 8: A light emission device having therein a reflection shade that supports at least a part of a light emission tube which is almost straight in shape and emits light in a radial manner, wherein the reflection shade is equipped with a reflection portion arranged on the circumference of the light emission tube, a flank portion provided on a side edge on at least one side of the reflection portion, and with paired arm portions formed on the flank portion, and the light emission tube is supported between the paired arms, while, the paired arms are formed to keep the form even when the reflection portion is changed in terms of shape in the direction to be opened in the flank portion.
Incidentally, in each Structure, light is made to advance toward an object without advancing toward the light emission tube, which implicates that light subjected to secondary reflection on the reflection surface advances toward an object as a result.
DETAILED DESCRIPTION OF THE INVENTION
Since a light emission device of Structure 1 is represented by one having therein a light emission tube which is almost straight in shape and emits light in a radial manner and a reflection shade that reflects light emitted from the light emission tube toward an object, wherein the reflection shade has a reflection surface wherein light emitted from the light emission tube in the direction opposite to the direction from the center of the light emission tube to an object and is reflected on the reflection shade does not interfere with the light emission tube, it is possible to reflect light that interferes with the light emission tube and was not utilized effectively in a light emission device in conventional technology, for example, and thereby to increase an amount of emitted light in the light emission device without increasing energy to be inputted in the light emission tube.
Since a light emission device of Structure 2 is represented by one having therein a light emission tube which is almost straight in shape and emits light in a radial manner and a reflection shade that reflects light emitted from the light emission tube toward an object, wherein the reflection shade has a reflection surface by which a part of reflected light which is to interfere with the light emission tube when the reflected light is reflected on a flat reflection plate that is in contact with the light emission tube is reflected toward the object without interfering with the light emission tube, it is possible to reflect light that interferes with the light emission tube and was not utilized effectively in a light emission device in conventional te
Miyauchi Kosei
Nakayama Haruki
Adams Russell
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Konica Corporation
Smith Arthur A
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