Abstract: A lens unit includes a lens barrel (7) with a through hole (6), a first lens (8a) press-fitted into the through-hole (6), a first step (9a) catching an outer edge of the first lens (8a) in the through-hole (6), a second lens (8b) press-fitted into the through-hole (6) in a direction of an optical axis of the first lens (8a), and a second step (9b) catching an outer edge of the second lens (8b) in the through-hole (6). The second lens (8b) has a diameter larger than that of the first lens (8a). A third step (10a) or a sloped portion broadening the through hole from the first lens to the second lens is further provided.

Abstract: This lens unit includes lens barrel (7) with through hole (6), first lens (8a) press-fitted into through-hole (6), first step (9a) catching an outer edge of first lens (8a) in through-hole (6), second lens (8b) press-fitted into through-hole (6) in a direction of an optical axis of first lens (8a), and second step (9b) catching an outer edge of second lens (8b) in through-hole (6). Second lens (8b) has a diameter larger than that of first lens (8a). Third step (10a) or a sloped portion broadening through hole from the first lens to the second lens is further provided.

Abstract: The present invention provides a method of producing an electrolytic capacitor including a porous anode and a solid electrolyte made of a conductive polymer, which can improve coating properties of the conductive polymer on an external surface of the porous anode and productivity. By controlling a polymerization rate, it is possible to sufficiently coat the external surface of the porous anode and fill inner spaces of a lot of pores of the porous anode with the conductive polymer with less numbers of polymerization in comparison with a method of the prior art, thereby obtaining an electrolytic capacitor with small leak current and high reliability.