Abstract: An imaging lens according to the present invention includes a negative first lens, a meniscus-shaped negative second lens having a concave surface facing to an object side, a positive third lens, a positive fourth lens having a convex surface on the object side, a positive fifth lens, a negative sixth lens, and a positive seventh lens arranged in order from the object side. Furthermore, an imaging device according to the present invention includes the imaging lens.

Abstract: An imaging lens according to the present invention includes a negative first lens, a meniscus-shaped negative second lens having a concave surface facing to an object side, a positive third lens, a positive fourth lens having a convex surface on the object side, a positive fifth lens, a negative sixth lens, and a positive seventh lens arranged in order from the object side. Furthermore, an imaging device according to the present invention includes the imaging lens.

Abstract: There is provided a stop apparatus which does not cause the reduction of resolving power and does not cause unevenness of amount of light in an imaging plane even when it is an object of very high intensity. The stop apparatus of the present invention comprises an upper blade 210, a first ND filter 216 mounted on an aperture of the upper blade 210, a lower blade 220, a second ND filter 226 mounted on an aperture of the lower blade 220, a stop unit plate 230 movably supporting the upper and lower blades 210 and 220, and a galvanometer 240 for linearly driving the upper blade 210 in a first direction and for linearly driving the lower blade 220 in a second direction opposite to the first direction. The ray transmittance of the first ND filter 216 is different from that of the second ND filter 226 so as to prevent reduction of the contrast of object with reference to other object situated at a distance different from the object distance of the focused object.

Abstract: When an imaging device is mounted, a light quantity adjustment cover that adjusts a quantity of incident light into the imaging device is fit to the imaging device. The light quantity adjustment cover may be made of synthetic resin. The light quantity adjustment cover can be attached to and detached from the imaging device. Accordingly, before the imaging device is mounted, the imaging device can be protected, and after the imaging device is mounted, it can easily be detached.

Abstract: The helical guide apparatus includes a main spindle, a male pattern, a first female pattern and a second female pattern which are operatively associated with one another. As the main spindle adapted to reciprocably move in the axial direction and rotate in the circumferential direction is reciprocably driven in the axial direction by first reciprocable driving means, it carries out reciprocable rotational movement in accordance with a lead which is determined by a combination of the first helical projection on the male pattern and the first helical recess on the first female pattern.