JPH0712965Y2 - Binoculars prism fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a device for fixing a prism used in prism binoculars to a lens barrel in an adjustable state.

(Prior Art) Two ridges are provided in the vertical direction on the inner peripheral surface of the lens barrel of binoculars with a certain distance therebetween, and the two ridges open the upper side and close the lower end. A prism provided with a fixing plate having a thickness, a lateral width and a height matching the pair of grooves, which are provided at a position facing the inner peripheral surface of the lens barrel. By inserting from above the opened groove, the left and right sides of the fixing plate are aligned with the groove and fixed using an adhesive or the like.

(Problems to be solved by the invention) However, since the binoculars need to hold the optical axes of the two telescopes in parallel to each other, the conventional binoculars have been used to fix the pair of prisms on the objective lens side and the eyepiece side to the lens barrel. In terms of technology, there was a drawback in that it required highly precise manufacturing technology and was expensive in terms of cost.

(Means for Solving the Problem) Therefore, according to the present invention, regarding the width of the groove formed by the pair of protrusions on the inner peripheral surface of the lens barrel, the thickness width and the lower end of the left and right sides of the fixing plate of the prism are set. By matching only those, and forming a so-called V shape that gradually widens upward,
It is an adjustable prism.

(Operation) Since the present invention is configured as described above, when the prism fixing plate is inserted into the groove, the lower end is fixed, but the upper end is tiltably held. In the semi-fixed state after applying the adhesive, the fixing plate is pressed from the outer surface of the lens barrel with screws that are in contact with the prism side surface, and by tilting this, the optical axis of the telescope is adjusted, and then the prism is mirrored. Stick to the torso.

(Example) Below, implementation of illustration is demonstrated. FIG. 1 is a perspective view showing a prism of the present invention. FIG. 2 is a perspective view of a lens barrel whose upper surface has an opening. FIG. 3 is an elevation view of the groove as viewed from the inside of the lens barrel. FIG. 4 is a partially cutaway plan view of the lens barrel. 1 is a prism. Reference numeral 2 denotes a rectangular fixing plate provided on the rear surface of the prism, and its height and width are substantially the same as the height and width of the prism and have a constant thickness, but are fixed on the left and right sides. The shape of the fixing plate need not be rectangular as long as it has a thick vertical portion. Reference numeral 3 is a binocular lens barrel. 4,4 and 4 ',
Designated by 4'is a pair of ridges provided so as to face the inner peripheral surface of the lens barrel 3. Numerals 5 and 5'are grooves formed by the ridges 4, 4 and 4 ', 4', with the upper part having an open shape and the lower end closed. The width of the grooves 5, 5'as viewed from the inner peripheral surface is the same as the thickness of the fixing plate 2 of the prism 1 at the lower end, but is formed in a so-called V-shape that gradually widens upward. next,
When fixing the prism 1 to the lens barrel 3, as shown in FIG. 2, in a state in which the upper portion of the lens barrel 3 is opened, the fixing plates 2, 2 of the prism 1 are formed in the groove shapes 5, 5'from above. , And fix the lower end to the lower ends of the grooves 5, 5 ', and fix the fixing plate 2,
Since the upper part of 2'is tiltably held in the grooves 5 and 5 ', adhesive is applied to the grooves 5 and 5'and in the semi-fixed state, as shown in FIG. After the tip of the screw 6 protruding on the outer surface of the body 3 is brought into contact with the side surface of the prism 1,
By screwing this, the fixing plates 2, 2 are tilted, the optical axis of the telescope is adjusted, and then the prism is fixed to the lens barrel 3.

(Effects of the Invention) As is clear from the above description, the present invention does not fix the prism fixing plate by simply inserting it into the groove of the lens barrel as in conventional binoculars, but it is essential for binoculars. It is a simple structure that makes it possible to adjust the left and right optical axes, which is a requirement, with a so-called V-shaped groove.
Since the manufacturing cost can be kept extremely low, there is an economic effect that it is possible to obtain highly accurate binoculars even with inexpensive ones.

[Brief description of drawings]

FIG. 1 is a perspective view, FIG. 2 is a perspective view, FIG. 3 is an elevation view, and FIG. 4 is a partially cutaway plan view. 1 is a prism, 2 is a fixing plate, 3 is a lens barrel, 4 , 4 and 4 ', 4'are ridges, 5, 5'are grooves, and 6 is a screw.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A pair of vertical ridges are formed at appropriate positions on the inner peripheral surface of the lens barrel to face each other, thereby forming a pair of ridges. Close the lower end, gradually widen upward, and insert a prism with a rectangular fixed plate on the back and back with a certain thickness into the right and left sides of the fixed plate from above the pair of grooves. , The lower end of the fixing plate is aligned with the lower end of the groove, and the upper part of the fixing plate can be tilted in the groove in the inserted state, and the screw mounted on the outer surface of the lens barrel is screwed. The prism side of the binoculars, which is characterized in that the side surface of the fixed plate is fixed to the groove with an adhesive after the side surface of the fixed plate is tilted and the optical axis is adjusted by tilting the fixed plate apparatus.