JPH0364741A - Stroboscopic device - Google Patents

Abstract

PURPOSE:To allow stroboscopic light to fully irradiate an object at the time of macro photographing and to prevent an improper light quantity by slidably providing a condenser lens condensing stroboscopic light toward the object so that the lens moves toward or away from the optical axis of a photographing lens. CONSTITUTION:When an operational button 10 is moved to the right and left of a stroboscopic device main body, an engaging pin 7 slides on a slide frame 8, so that the optical axis 6a of Fresnel lens 6 moves toward or away from the optical axis 2a of the photographing lens 2. When the photographing lens 2 is set in a macro mode, the operational button 10 is operated to bring the Fresnel lens 6 close to the photographing lens 2. Then, the quantity of stroboscopic light, which converges on the optical axis 6a of the Fresnel lens 6 and comes out toward the optical axis 2a of the photographing lens 2, comes to increase. Consequently, the irradiation range of stroboscopic light can be pointed toward the object, whereby the stroboscopic light fully irradiates the object at the time of macro photographing to prevent an improper light quantity.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a strobe device.

(Prior Art) Conventionally, strobe devices that can be easily attached to and removed from a camera and those that are included in a camera body are known.

This strobe device consists of a strobe block installed in the camera body, a reflector housed in the strobe frame, a light emitter placed near the focal point of the reflector, and a Fresnel unit placed in front of the reflector. A lens (condensing lens) is provided, and the strobe light emitted from the light emitter and the strobe light reflected by the reflecting mirror are condensed toward the subject by the Fresnel lens.

(Problems to be Solved by the Invention) Some modern cameras, including lens shutter cameras, are equipped with a photographing lens optical system that allows close-up photography of a subject. However, in conventional strobe devices, the focusing optical axis of the Fresnel lens is fixed so that the light from the arc tube is focused in the direction of the central axis of the arc tube, so when taking close-up shots, There is a problem in that the irradiation range of the strobe light deviates from the subject captured by the photographic lens, resulting in inappropriate illumination of the subject.

(Means for Solving the Problems) In order to solve the above problems, a strobe device according to the present invention is characterized in that it is configured as described in the claims.

(Function) When taking a close-up photograph using a photographing lens, if the optical axis of the condensing lens is brought close to the optical axis side of the photographing lens, sufficient strobe light can be irradiated to the entire subject even during close-up photography.

(Example) Hereinafter, an example of a strobe device according to the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of a strobe device according to a first embodiment, and 1 is a strobe device.

This strobe device 1 is removably attached to a camera body (not shown) and is disposed near a photographic lens 2 capable of macro photography. The strobe device 1 includes a strobe frame 3, a reflector #I4 disposed within the strobe frame 3 (see Fig. 2), a strobe tube 5 disposed within the reflector 4, and a reflector #I4 disposed in the strobe frame 3, and a strobe tube 5 disposed in the reflector 4. A Fresnel lens 6 (condensing lens) is provided.

The Fresnel lens 6 has an optical axis 6a that focuses strobe light in an orthogonal direction. A retaining pin 7 is provided protruding from the lower part of the Fresnel lens 6. The retaining pin 7 is slidably provided on a slide frame 8 disposed in front of the strobe frame 3 of the strobe device main body.

The slide frame 8 extends in the left-right direction of the strobe device main body. An engaging protrusion 9 is provided protruding from the upper end of the Fresnel lens 6 near the photographic lens 2 . A macro operation button 10 protruding from the strobe device main body is provided on the engagement protrusion 9, and the Fresnel lens 6 is slid by moving the macro operation button 10 in the left-right direction of the strobe device main body. . The macro operation button 10 includes a slide plate 11 that slides along the upper wall surface of the strobe device main body, and the slide plate 11 closes an opening provided on the top surface of the strobe device main body.

In this embodiment, when the operation button 10 is moved in the left-right direction of the strobe device main body, the engagement pin 7 slides in the slide frame 8, and the optical axis 6a of the Fresnel lens 6 aligns with the optical axis of the photographic lens 2. Approaching and moving away from 2a (see Figures 2 and 3)
.

When the photographic lens 2 is set to the macro mode, when the Fresnel lens 6 is moved closer to the photographic lens 2 by operating the operation button 1O, the light is converged on the optical axis 6a of the Fresnel lens 6 and emitted in the direction of the optical axis 2a of the photographic lens 2. This results in an increase in the amount of strobe light (arrow AI in Figure 3).

A2. Since the irradiation range of the strobe light can be directed toward the subject, the subject can be sufficiently irradiated with the strobe light even during macro photography.

4 to 16 show a second embodiment of the present invention, in which the strobe device is provided in the camera body (not shown).

A retaining bottle 11 is protruded from the center of the upper end of the Fresnel lens 6, and the photographic lens 2 is located at the lower end of the Fresnel lens 6.
An engagement pin 12 is protruded from the m#1 portion 6d on the ° side. The locking bin 11 is slidably supported by a slide frame 13 attached to the strobe storage chamber of the camera body. The slide frame 13 has a long hole 13a extending in the left-right direction of the camera body, and the engagement pin 11 is inserted into the long hole 13a.
It is held at a. The engagement pin 12 is attached to a cam plate 14 whose sliding direction is regulated in the left-right direction of the camera body. The cam plate 14 has a cam groove 1 extending diagonally.
4a is open. The cam groove 14a has an engaging protrusion 15 of an engaging portion 15 protruding from the circumferential surface of the photographing lens barrel 2'.
a is slidably held. The photographic lens barrel 2° advances to the front of the camera body during macro photography, and the photographic lens barrel 2° retreats toward the camera body during normal photography. 15a slides in the cam groove 14a, the cam plate 15 is drawn toward the photographic lens barrel 2' side, and the Fresnel lens 6 slides toward the 2° side of the photographic lens barrel. When changing the taking lens barrel 2° from macro photography to normal photography, as shown in FIG. 5, when the taking lens barrel 2'' approaches the camera body side, the cam plate 14 slides toward the strobe frame 3 side The optical axis 6a of the Fresnel lens 6 is located at the center of the strobe frame 4.

Therefore, when the photographing lens barrel 2° is placed in the macro shooting state, the optical axis of the Fresnel lens 6 is displaced from the center of the strobe frame 3 toward the photographing lens barrel 2° side, and when the strobe light is emitted, the photographing lens mirror f12 The amount of strobe light emitted in an oblique direction approaching the optical axis 2'' of ' is increased,
The entire subject is sufficiently irradiated with strobe light, and inappropriate light intensity is prevented.

(Effects of the Invention) As described above, in the strobe device according to the present invention, the condenser lens that condenses the strobe light of the strobe light emitting device toward the subject approaches and departs from the optical axis of the photographic lens. Since it is provided so that it can be slid in the direction, in the case of macro photography, the condensing lens is slid so as to approach the optical axis of the photographing lens, and the condensing lens approaches the optical axis of the LSS shape lens that emits strobe light. Since the amount of strobe light traveling in the direction increases, the subject is sufficiently irradiated with strobe light, thereby preventing inappropriate light amount.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a strobe device according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram showing a normal photographing state of the 71 Nonel lens of the first embodiment, and FIG. 3 is a Fresnel diagram of the first embodiment. FIG. 4 is a perspective view of the Fresnel lens according to the second embodiment of the present invention; FIG. 5 is an explanatory diagram showing the Fresnel lens of the second embodiment in the normal photographing state; FIG. 5 is an explanatory diagram of the Brenell lens of the second embodiment in a macroscopic image state. , 1... Strobe device 2... Taking lens barrel 2a... Optical axis of taking lens 5... Strobe tube 6... Fresnel lens (condensing lens 1) 6a... Light from Fresnel lens Shaft 7... Engagement bottle 8... Slide frame 10... Operation button procedure amendment form (method) % formula % Name of the invention Relationship to the strobe device correction case Applicant name (052) Asahi Optical Co., Ltd. Agent of Kogyo Co., Ltd.
〒135. Telephone: 03-820-1811 Address: 1-14-3 Monzennakacho, Koto-ku, Tokyo November 13, 1999 (Delivery: November 28, 1999) 8. Brief description of drawings in the specification subject to amendment 7. In the second line of page 8 of the statement of contents of the amendment, “Figure 5” has been replaced with “Figure 6.”
Correct it to ``Figure''.

Claims (1)

[Claims] A strobe device characterized in that a condensing lens for condensing strobe light from a strobe light emitting device toward a subject is slidably provided in directions toward and away from an optical axis of a photographic lens.