【図面の簡単な説明】[Brief explanation of the drawing]
第１図は本考案の一実施例のｆθレンズ１を用
いたレーザプリンタ２の基本的な構成を示す平面
図、第２図はｆθレンズ１のハウジング本体４に
対する取付構造を説明するための分解斜視図、第
３図はｆθレンズ１の斜視図、第４図はｆθレン
ズ１の断面図、第５図は第１ｆθレンズ部分１１
の斜視図、第６図は第１ｆθレンズ部分１１の断
面図、第７図は第２ｆθレンズ部分１２の斜視図
、第８図は第２ｆθレンズ部分１２の断面図、第
９図はハウジング本体４の平面図、第１０図はハ
ウジング本体４の第９図の切断面線―から見
た断面図、第１１図はハウジング本体４の第９図
の切断面線―から見た断面図、第１２図
はばね部材２２の平面図、第１３図はばね部材２
２の第１２図示矢符６１方向に見た側面図、第１
４図はばね部材２２の第１２図示矢符６２方向に
見た側面図、第１５図はばね部材２１の平面図、
第１６図はばね部材２１の第１５図示矢符７１方
向に見た側面図、第１７図はばね部材２１の第１
５図示矢符７２方向に見た側面図、第１８図はば
ね部材３１の平面図、第１９図はばね部材３１の
第１８図示矢符８１方向に見た側面図、第２０図
は本考案の他の実施例であるｆθレンズ９０の基
本的な構成を示す断面図である。
１，９０……ｆθレンズ、２……レーザプリン
タ、４……ハウジング本体、１１，９１……第１
ｆθレンズ部分、１２，９２……第２ｆθレンズ
部分、１１ａ，１２ａ……有効部、１１ｂ，１２
ｂ，９２ｂ……フレーム。
FIG. 1 is a plan view showing the basic configuration of a laser printer 2 using an fθ lens 1 according to an embodiment of the present invention, and FIG. 2 is an exploded view showing the attachment structure of the fθ lens 1 to the housing body 4. 3 is a perspective view of the fθ lens 1, FIG. 4 is a sectional view of the fθ lens 1, and FIG. 5 is a first fθ lens portion 11.
6 is a sectional view of the first fθ lens portion 11, FIG. 7 is a perspective view of the second fθ lens portion 12, FIG. 8 is a sectional view of the second fθ lens portion 12, and FIG. 9 is a sectional view of the housing main body 4. FIG. 10 is a cross-sectional view of the housing body 4 taken along the cutting line in FIG. 9, FIG. 11 is a cross-sectional view of the housing body 4 taken along the cutting line in FIG. 9, and FIG. The figure is a plan view of the spring member 22, and FIG. 13 is a plan view of the spring member 2.
2, a side view seen in the direction of the twelfth arrow 61, the first
4 is a side view of the spring member 22 seen in the direction of the 12th arrow 62, FIG. 15 is a plan view of the spring member 21,
16 is a side view of the spring member 21 seen in the direction of arrow 71 shown in FIG.
5. FIG. 18 is a plan view of the spring member 31. FIG. 19 is a side view of the spring member 31 as seen in the direction of arrow 81 in FIG. 18. FIG. 20 is a side view of the present invention. FIG. 3 is a sectional view showing the basic configuration of an fθ lens 90 according to another embodiment of the present invention. 1,90...fθ lens, 2...laser printer, 4...housing body, 11,91...first
fθ lens part, 12, 92...Second fθ lens part, 11a, 12a...Effective part, 11b, 12
b, 92b...frame.