Patent ID: 8472096

Claim:
A method of manufacturing an oscillator device having first and second oscillators supported by a fixed member for torsional oscillation around a torsional axis through first and second torsion springs, the oscillator device being driven at first and second driving resonance frequencies gf1 and gf2, said method comprising: a first step for processing the two oscillators, wherein, when the two oscillators are going to be processed as oscillators having first and second resonance frequencies different from the two driving resonance frequencies with a certain dispersion range, the two oscillators are so processed that the first and second resonance frequencies different from the two driving resonance frequencies become equal to first and second resonance frequencies f1 and f2, respectively, which are included in adjustable resonance frequency ranges, respectively; and a second step for adjusting the first and second resonance frequencies f1 and f2 so that they become equal to the first and second driving resonance frequencies gf1 and gf2, respectively, wherein, for manufacture of the oscillator device at said first step, when first and second spring constants of the first and second torsion springs under the first and second driving resonance frequencies gf1 and gf2 are denoted by k1 and k2, respectively, minimums at a lower limit side of the first and second spring constants are denoted by k1a and k2a, respectively, and maximums at an upper limit side of the first and second spring constants are denoted by k1b and k2b, respectively, and where the first and second torsion springs are made in spring constant ranges which are expressed by k 1 a<k 1< k 1 b k 2 a<k 2 <k 2 b, the oscillator device is made so that the first and second resonance frequencies f1 and f2 of all oscillators to be produced individually are put in resonance frequency ranges which satisfy equation (1) to equation (4) below: ⁢ f ⁢ ⁢ 2 ≥ 1 2 ⁢ π ⁢ k ⁢ ⁢ 1 ⁢ ⁢ b I ⁢ ⁢ 1 ⁢ ( 1 + k ⁢ ⁢ 2 ⁢ ⁢ a k ⁢ ⁢ 1 ⁢ ⁢ b - 4 ⁢ ⁢ f ⁢ ⁢ 1 2 ⁢ I ⁢ ⁢ 1 ⁢ ⁢ π 2 ) ⁢ ⁢ ⁢ wherein ⁢ ⁢ I ⁢ ⁢ 1 = gf ⁢ ⁢ 1 2 ⁢ k ⁢ ⁢ 1 ⁢ ⁢ b ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ a + gf ⁢ ⁢ 2 2 ⁢ k ⁢ ⁢ 1 ⁢ ⁢ b ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ a + k ⁢ ⁢ 1 ⁢ ⁢ b ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ a 2 ⁢ ⁢ ( gf ⁢ ⁢ 1 4 ⁢ ⁢ k ⁢ ⁢ 1 ⁢ ⁢ b + gf ⁢ ⁢ 2 4 ⁢ ⁢ k ⁢ ⁢ 1 ⁢ ⁢ b - 2 ⁢ ⁢ gf ⁢ ⁢ 1 2 ⁢ ⁢ gf ⁢ ⁢ 2 2 ⁢ ⁢ ( k ⁢ ⁢ 1 ⁢ ⁢ b + 2 ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ a ) ) 8 ⁢ ⁢ gf ⁢ ⁢ 1 2 ⁢ ⁢ gf ⁢ ⁢ 2 2 ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ a ⁢ ⁢ π 2 ( 1 ) ⁢ f ⁢ ⁢ 2 ≤ 1 2 ⁢ π ⁢ - k ⁢ ⁢ 1 ⁢ ⁢ a ⁢ ⁢ k ⁢ ⁢ 2 ⁢ b ⁢ ⁢ ( k ⁢ ⁢ 2 ⁢ ⁢ b - 4 ⁢ ⁢ f ⁢ ⁢ 1 2 ⁢ ⁢ I ⁢ ⁢ 2 ⁢ π 2 ) I ⁢ ⁢ 2 ⁢ ( - k ⁢ ⁢ 1 ⁢ ⁢ a ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ b + 4 ⁢ ⁢ f ⁢ ⁢ 1 2 ⁢ I ⁢ ⁢ 2 ⁢ ( k ⁢ ⁢ 1 ⁢ ⁢ a + k ⁢ ⁢ 2 ⁢ ⁢ b ) ⁢ π 2 ) ⁢ ⁢ ⁢ ⁢ wherein ⁢ ⁢ I ⁢ ⁢ 2 = gf ⁢ ⁢ 1 2 ⁢ k ⁢ ⁢ 1 ⁢ ⁢ a ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ b + gf ⁢ ⁢ 2 2 ⁢ k ⁢ ⁢ 1 ⁢ ⁢ a ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ b - k ⁢ ⁢ 1 ⁢ ⁢ a ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ b 2 ⁢ ⁢ ( gf ⁢ ⁢ 1 4 ⁢ ⁢ k ⁢ ⁢ 1 ⁢ a + gf ⁢ ⁢ 2 4 ⁢ ⁢ k ⁢ ⁢ 1 ⁢ a - 2 ⁢ ⁢ gf ⁢ ⁢ 1 2 ⁢ ⁢ gf ⁢ ⁢ 2 2 ⁢ ⁢ ( k ⁢ ⁢ 1 ⁢ a + 2 ⁢ ⁢ k ⁢ ⁢ 2 ⁢ ⁢ b ) ) 8 ⁢ ⁢ gf ⁢ ⁢ 1 2 ⁢ ⁢ gf ⁢ ⁢ 2 2 ⁢ ⁢ ( k ⁢ ⁢ 1 ⁢ ⁢ a + k ⁢ ⁢ 2 ⁢ ⁢ b ) ⁢ π 2 ( 2 ) ⁢ f ⁢ ⁢ 1 < gf ⁢ ⁢ 1 ( 3 ) ⁢ f ⁢ ⁢ 2 < gf ⁢ ⁢ 2. ( 4 )