Page 225 -

216 6 Answers, Hints and Solutions
A1.7 There will be two development directions when device/system size
decreases: the number of functions will decrease (commercialization-oriented
direction), and the number of functions will increase (research-oriented direc-
tion). See Sect. 1.5.

Chapter 2

A2.1 See Fig. A.1. 100

Resonant frequency (kHz) 80 0.5 1 2 3 Thickness 4 mm

60
40
20
0
300
0
200
100
Length (mm) 400 500
Fig. A.1. Relationship between the cantilever resonant frequency f 0 and the length
l, with thickness t as a parameter

A2.2 See Fig. A.2.

Spring constant (mm) 100 1 2 mm 3 mm Thickness
10
4 mm

0.1
0.01 0.5 mm 1 mm
0 100 200 300 400 500
Length (mm)

Fig. A.2. Relationship between the cantilever spring constant K and the length l,
with thickness t as a parameter

A2.3 Since the LD facet reflectivity R 2 facingthe medium is greatly reduced
by an antireflection coating to improve the signal-to-noise ratio, the light