JPS62150213A - Photographing lens mechanism - Google Patents

Abstract

PURPOSE:To obtain a photographing lens mechanism which can selectively change the unclear condition of the front or rear side of an object, by changing at least the direction of the lens optical system in a lens barrel. CONSTITUTION:This lens mechanism is constituted in such a way that a lens frame 200 supporting a lens optical system is coupled with a lens barrel 100. A screw thread section 101 for coupling the lens frame 200 is formed on the inner peripheral surface on the front end side of the lens barrel 100 and, at the same time, screw thread sections 201 and 202 corresponding to the screw thread section 101 of the lens barrel 100 are formed on both front and rear surfaces of the lens frame 200. Therefore, the unclear condition of the front or rear side of an object can selectively be changed by using only one lens optical system when the mounting condition of the lens frame is changed depending upon the photographing intention. Thus the taste of photographing with a camera can be doubled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) Unoccurred IJI occurs in lens mechanisms for photography, particularly in lens mechanisms for eye flex cameras.

(Prior art and its problems) In conventional single-lens reflex cameras, the lens optical system is fixedly supported within the lens barrel, so the focus is adjusted according to the spherical aberration of the photographic lens. The amount of blur between the foreground and the background of the subject is determined, and it is impossible to change this according to the photographer's intentions, other than replacing the lens with a different optical system. .

(Purpose of the invention) In view of the situation in Japan as described in 1-1, Unexploded II is designed to reduce the blurring of the subject from the front side to the rear side to the L side by changing the direction of the lens optical system in the lens barrel. The purpose is to provide a photographic lens mechanism that can selectively change its orientation.

(Structure of the Invention 1 &) For this reason, 1 the lens mechanism according to the present invention has a lens optical system supported on a lens frame which is provided with connecting portions to the lens barrel on both the front and back surfaces thereof, and a connecting surface of the lens frame to the lens barrel. The structure is such that the direction of the lens optical system can be reversed by changing .

(Example) The first illustrated camera is configured to connect a lens frame 200 supporting a lens optical system to a lens mirror lI4100.

A lens frame 200 is provided on the inner peripheral surface of the tip side of the lens mirror 114100.
When the threaded part 101 for connection is formed, threaded parts 201 and 202 corresponding to the threaded part 101 of this lens barrel 100 are formed on both the front and back surfaces of the lens barrel 200. .

In the lens a structure constructed in this way, 'A' of the lens frame 200
Assuming that the lens optical system in the form of IE is shown in FIG. 2(a) in which the lens frame 200 is attached by screwing the surface-side threaded portion 202 to the threaded portion 1101 of the lens barrel 100, the spherical aberration at this time is As shown in Figure 2(b), on the contrary, the mirror frame 20
When the front side threaded part 201 of the lens barrel lOO is screwed onto the threaded part 101 of the lens barrel lOO, the lens optical system will be as shown in Fig. 3(a), and the spherical aberration at that time will be as shown in Fig. 3(a). The results are as shown in b).

In other words, despite using the same lens optical system,
In the case shown in the second figure, there will be negative spherical aberration, so the far side of the subject will be photographed with a natural blur, and in the case shown in the third figure, there will be positive spherical aberration, so the subject will be photographed with a natural blur. The front side will be naturally blurred.

(Effects of the Invention) As described above, according to the lens mechanism according to the present invention, by using the negative lens optical system, the mounting state of the lens frame can be reversed according to the shooting intention, and the blur state after the subject ryJ can be improved. There are many options to choose from, and you can double your interest in camera photography.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a camera employing the lens mechanism according to the present invention, and Fig. 2 is a view of the lens optical system with the back side of the lens frame attached to the lens barrel and its spherical aberration. FIG. 3 is an explanatory diagram showing the lens optical system and its spherical aberration with the front side of the lens frame attached to the lens barrel. 100... Lens barrel 200... Lens barrel 101-
201-202-... Threaded part (connection part) ItIF applicant Applicant Kogaku Kogyo Co., Ltd. 1st drawing

Claims (1)

[Scope of Claims] A lens optical system is supported by a lens frame that has connection parts to the lens barrel on both the front and back surfaces, and the orientation of the lens optical system is changed by changing the connection surface of the lens frame to the lens barrel. A photographic lens mechanism characterized by being configured such that it can be reversed.